1 divided by 0 (a 3rd grade teacher & principal both got it wrong), Reddit r/NoStupidQuestions kzread.info/dash/bejne/iX2T07J7gcuwg7A.html

@mekaindo

9 күн бұрын

"NoStupidQuestions"

@shelby-r1e

7 күн бұрын

How dare you not factor in the crust.

If the radius of pizza is z, and the thickness is a, the volume of the entire pizza is just pizza.

@dannyyeung8237

19 күн бұрын

Yes I knew about it on 29 March 2024

@imveryangryitsnotbutter

19 күн бұрын

Mmm, πz²a.

@rujon288

19 күн бұрын

cook

@retardigrade69

19 күн бұрын

This touched my brain in a very funny way

@Ahmed-kg2gf

19 күн бұрын

​@@imveryangryitsnotbutter π is pi and z² is zz

This is a perfect example for kids in school asking when they will ever use math outside of school.

@deivisnx

14 күн бұрын

Yeah, except i can use a calculator sooo...

@sergio73master1

14 күн бұрын

And except kids nowdays don't give a fck about the price or economy in general. The next Tik-tok video resets their worries...

@KingAfrica4

13 күн бұрын

​@@deivisnxcalculator not useful if you don't know the formula...

@rebane2001

13 күн бұрын

​@@KingAfrica4you don't even need to know the formula by heart, just that it exists and that it's applicable here

@josevictorribeirolisboa7576

13 күн бұрын

Pretty sure people wouldn't use this for pizza. Nobody is going to use math for that.

I am so sorry. I ate both pieces while attempting to solve.

@sureshmukhi2316

18 күн бұрын

😂

@perrinromney4555

7 күн бұрын

Which one took longer to eat? If you can determine that, we have ourselves an empirical solution.

@keescanalfp5143

22 сағат бұрын

​@@perrinromney4555, it'll always be the second i eat , just because it is the second , and because the difference between the volumes is rather small, as for my mouth .

Everybody's out there doing actual maths and I'm here just counting the number of pieces of pepperoni and being objectively correct.

@brownfamily1892

18 күн бұрын

This is the only correct method

@eminkilicaslan8945

18 күн бұрын

7" pizza has more pepperoni tho, but 6" pizza is more pizza per dollar.

@dark6.6E-34

18 күн бұрын

Dont forget the pictures on display can be misleading.

@0x1EGEN

18 күн бұрын

The question is about which has better price to size ratio, not which slice is bigger. 7 inch pizza is larger but also costs more.

@baranjan6969

18 күн бұрын

I just craft a glass bottle with those shapes and measure how many liters it takes to fill.

Since Pi is a common factor in the two areas, you can disregard that in the calculation and keep the maths easier.

@theodoremurdock9984

18 күн бұрын

1/360 is also a common factor that cancels out when you set up the ratio (also the units cancel out as long as they match, e.g. the ratio here is in square inches of pizza per square inch of pizza).

@feuerschlange6374

17 күн бұрын

​@@theodoremurdock9984 no, angle/360 does not cancel out. One being 45/360 = 1/8 And the other 60/360 = 1/6 That leaves you with 49*(1/8)*pi And 36*(1/6)*pi Since pi is in both only another factor you can ingore pi

@CornyFlakez

17 күн бұрын

​@@feuerschlange6374 nobody said anything about cancelling angle/360. They said that 1/360 is a common factor, which can be cancelled in both calculations. i.e. 60pi×6² and 45pi×7² However, the way I did it mentally was simplifying the fraction and expanding the square. ⅙pi×36 vs ⅛pi×49 pi can get cancelled 6 vs 49/8 = 6⅛ so the right one is slightly larger but proportionally much more expensive. So i estimated the left one is more worth it.

@peterpan408

17 күн бұрын

This would answer which is cheaper on a per area basis, but not tell you how much on a per area basis. But it wasn't asked so do it.

@GamingWithUncleJon

17 күн бұрын

​@@peterpan408so don't waste time on irrelevant calculations.

Bro has the quickswap skill unlocked for switching markers.

On paper, the first one is a better deal. But we cant forget that a larger angle means more crust. We should look at the ratio of crust to non crust as well.

@russellharrell2747

13 күн бұрын

Some people like more crust, especially if it’s stuffed.

@marcush4741

13 күн бұрын

@@russellharrell2747 absolutely fair. Still, crust to pizza ratio is definitely worth looking into.

@GG-mb9rr

11 күн бұрын

Or dipping sauce

@kylen6430

9 күн бұрын

While I agree with your point that crust is an important consideration, I just want to point out that a larger angle doesn’t strictly mean more crust. Both angle and radius are a factor, but in this case, yes the 6in piece has more crust

@Zack_Zander

8 күн бұрын

⁠@@russellharrell2747 Yep, I don't like the crust *_unless_* it is stuffed. Like, I would eat it in a group situation, but if I have the choice, I’ll skip it.

Real life example: Costco Pizza always have the best deal, very large, fairly affordable, and no need the hassle on figuring out which coupon to apply that provide the most mathematical and financial advantage.

@bokkenka

18 күн бұрын

Sure... Much like Ikea, they hope you leave with a good feeling about the food (Wow! That was a great deal!) so that it translates into a good feeling overall about shopping there. First impressions are important, but so are last impressions.

@danny1103

18 күн бұрын

​@@bokkenka I am still using my 15 year 70 inch desk from IKEA that was like $109 back then. The desk is still smooth and strong after moving like 5-8 times from house to house.

@johnpaullogan1365

18 күн бұрын

but you have to calculate the cost of an hour drive to get to a costco and the cost of the costco membership. math gets complicated.

@NO1xANIMExFAN

17 күн бұрын

​@@johnpaullogan1365the deals and frequency and amount of stuff I buy more than justifies the car drive and membership. It's a no brainer...

@sabin97

16 күн бұрын

@@johnpaullogan1365 those "members only" shops CAN be a good idea. if you go there often and buy a lot, because those small savings add up. but if you dont buy a lot, it's mostly not worth it.

I dunno man, you gotta consider the Crust Factor. The 1st Slice has a larger portion of the perimeter, thus more of a Crust/Cheese Ratio. Meanwhile, the 2nd Slice has less of a Crust Factor, and thus is appreciated at a higher value.

@Verxinn

19 күн бұрын

Don't forget the ergonomic aspect of pizza eating, its much easier and enjoyable to eat a thinner and longer slice

@ramennoodle2085

19 күн бұрын

Crust is the best part.

@highviewbarbell

19 күн бұрын

​@@Verxinnones worth is determined by their girth

@vincentlamontagne7639

19 күн бұрын

Assuming a contant 1 inch wide crust of both pizzas, pizza #2 has a better cost to toppings area ratio!

@patrickd9551

19 күн бұрын

@@vincentlamontagne7639 Euhmmm, no. I actually started out writing a comment exactly to this degree. But in fact the smaller pizza still has more area thanks to the larger angle. I was actually considering a partial value to the crust and was midway through the math when I decided to first check the basic math portion of it. Sooooo, I deleted the comment ;)

The volume of a cylindrical pizza with radius Z and thickness A spells PIZZA.

This is the type of question the teacher goes over in class that everyone loves and asks to be on the test.. then asks on the test as the final question “what width does the crust have to be for both pizzas (to the nearest quarter of an inch) for the deals to be equal for the cheese part?” .. simply to gauge if you truly understand what’s at stake in the original question.

@rockoutconsiderably

11 күн бұрын

I would love a video on how to figure this out please

I've used a bit different method to solve this: 1. Divide the area for the bigger piece by the area of the smaller piece (pi's and 360's cancel out). I've got 45/60*(7^2)/(6^2) = 1.02 or 2% growth in area for the bigger piece. 2. Divide the prices: 1.70/1.50 = 1.13 or 13% growth in price for the bigger piece. 3. Since the growth in price is bigger than growth in area, smaller piece will be a better deal.

@richard7199

14 күн бұрын

I just did 25 cents per inch and came up with 5 cent save for the 7 inch slice lol

@mawillix2018

14 күн бұрын

@richard7199 You forgot that the 7 inch pizza is thinner. With your logic a 10 by 1 rectangle of pizza is better than a 9 by 9 square of pizza.

@richard7199

14 күн бұрын

@@mawillix2018 I never said we’d get more food from it, merely that we get more inches of pizza.

@SunDry_Marchy

13 күн бұрын

And you were wrong on both occasions. You aren't measuring length of pizza to determine what's better cost-wise, you use the volume (well, not exactly, we won't be able to properly calculate V, so S is fairly sufficient) ​@@richard7199

@mawillix2018

13 күн бұрын

@@richard7199 That depends on how you measure the pizza.

Cut through the whole mess by never getting less than a whole pizza!

@jabbawookeez01

19 күн бұрын

thats y you get like the $6 little ceaser pizza or something and you get to enjoy it yourself. 💀

@taito404

19 күн бұрын

Ooh. I like that thinking. Very creative

@ailst

19 күн бұрын

In this case you still have to be able to calculate whether a 24 cm diameter for 4 € is a better deal then the 28 cm diameter for 6 €! And multiplying segment angle/360 is just one relatively easy additional step.

@neilgerace355

19 күн бұрын

@@ailst That's all true, but you still end up with more pizza :)

@jamesharmon4994

18 күн бұрын

​@neilgerace355 The question isn't which pizza is bigger, the question is which is the better value. Three is bigger than one, of course. But which should you choose if given the option $1 each versus three for $5. The one, of course. 😅

Next time I see someone pull out a whiteboard while waiting in line to buy a slice, now I'll know why.

Theoretically the thinner longer slice will be better since it will have less of that outer edge crust depending how much it takes up

@martygreenspan-xy2jo

13 күн бұрын

Exactly! You have to take into account what portion of each is crust, cause everyone knows that cheesybites > crustybites.

@theNaluK

11 күн бұрын

This is exactly what I was thinking!

@GG-mb9rr

11 күн бұрын

Not if you have dipping sauce for the crust

@Zakon213

11 күн бұрын

Similarly, when I compute the value of pizza, I subtract 1 inch from the radius due to the crust

@macromite3758

11 күн бұрын

outer edge crust is the best part. if you don't like it then you are a baby.

Now calculate how much more crust you are buying on the 6" slice.

@jamesharmon4994

18 күн бұрын

Eat the crust!! 😅

@Snaproductions

18 күн бұрын

the frust is good

@MrSparkefrostie

18 күн бұрын

That's the best part, that just improves the value of the 6' slice

@janb.3600

18 күн бұрын

The 60° slice has 8/7 times the crust of the 45° slice, which makes it better.

@phiefer3

17 күн бұрын

Assuming the crust is about 1 inch thick, the 6 inch slice has a better price per crust ratio AND a better topping per price ratio than the 7 inch slice.

With just a couple of tricks you actually don't have to calculate exact values. First pizza has 36 square units for 9 bucks, so it's 4 units for $1. Second pizza has 49 units for 1.7*8 = $13.6, but for $13 we can buy 52 units of the first pizza. So, first is cheaper.

@tranmanhuc6235

18 күн бұрын

i did the same thing

@user-vc2yq4mm6t

18 күн бұрын

My brain said, "bigger angle, not big difference in size, lower cost. Go with bigger for less cost." No need for math.

@OrangeC7

18 күн бұрын

I did something similar but I did some division so I had to use a calculator for the last bit. Using just multiplication is a lot nicer

@gaia9020

18 күн бұрын

The number of pieces does not take in account the diameter or radius of the individual pizza. The first has a diameter of 12, the second of 14, so the second might still be the better deal due to it being larger, thus to just count the pieces is not sufficent :)

@Apollorion

18 күн бұрын

@@gaia9020 I think you misunderstood Nomimasu's OP. Nomimasu spoke of _square unit_ which I think was a unit for surface area, i.e. square inch over pi. The numbers of calculation shown were acquired by filling up the discs & realizing that the surface area of a disc is proportional to the square of their radius a.w.a. that the constants that reappear in the expressions for both discs cancel each other out when comparing the two discs.

49/36*6/8 = means second slice is 2% bigger but ~15% more expensive.

@oliverschell7014

19 күн бұрын

Yes, but 13 % more expensive.

@GamerNineSix

19 күн бұрын

But also less crust

@lupolinar

18 күн бұрын

Also more salami slices

@Zhcwu

8 күн бұрын

Bread costs nothing but good pepperoni and cheese costs a lot.

Since you are only comparing the price/area of the two slices, pi cancels out and need not be calculated.

@MikehMike01

19 күн бұрын

The 360 as well But then you will only be determining the better value and not the specific values

@msolec2000

19 күн бұрын

Also the 360º in the denominator cancels out

@zeroone8800

19 күн бұрын

@@msolec2000 I prefer to instead reduce the angles to 1/6 and 1/8. The areas then become 6(pi) and 49/8*(pi).

@ajejebrazov2

19 күн бұрын

​@@zeroone8800I did the same,so no need to approximate, which always introduce error

@57thorns

19 күн бұрын

@@zeroone8800 Yes, and the of course pi goes away as well, which is a shame as I like pie as well as pizza.

Love this problem. Gave it to my students once and as a bonus had them calculate how long the pizza would have to be for them to get the same deal if the pizza was only 1° wide lol

@R2Bl3nd

19 күн бұрын

I would love to eat a pizza like that. It would be like having a conveyor belt made of crust, which is carrying sauce, cheese and toppings into my mouth.

@johnpaullogan1365

18 күн бұрын

so a 1/2" radius pizza with a 45 degree arc? or a different radius and theta such that the length of the arc measures 1 inch but the area of that section of the pizza is such that it is 17/15 the area of the first?

@HeShoeTooBig

10 күн бұрын

If I were a student, i would have just said "it'd be more efficient to just weigh slices." Seriously, by the time you solve this, the pizza done got cold.

You don't need to calculate the areas, just the ratio of 36/6 to 49/8. The latter shows the narrow slice is just barely larger, by a lesser factor than the price differential.

@abacaabaca8131

18 күн бұрын

But you still need to consider the price factor. Like so: 1.50/(36/6) vs 1.70/(49/8)

@johnpaullogan1365

18 күн бұрын

@@abacaabaca8131 or just check if 1.5*(49/8)/(36/6) is less than 1.7. simplifying gives us (3/2)*49/48) on the left side which is 147/96 which is 1.53125. so unless the second slice is less than that it is a worse deal

@meurdesoifphilippe5405

15 күн бұрын

Yes, or compare 36*4, and 49*3, so 144 vs 147. Almost same area, while the difference in prices is much greater.

@snestah

14 күн бұрын

Yeah, this is simpler to compare with fractions and highlights why you need to be comfortable with using fractions and decimals. No need to calculate pi, save time to eat the pie.

Thank you for the excellent content!

I simply figured how much each pizza would cost once you added each slice to equal 360*. A) 1.50 x 6 =$9 B) 1.70 X 8 = $13.60 Knowing that two more slices of A would still be less costly than B. However, if B was better quality and taste and there were only two people sharing the pizza B would be the better choice. Simply based on shared experience.

Gotta love unit pricing - VERY useful at the grocery store! In Australia the grocery has to show you the unit price on the shelf - EASY PEASY!

@johnpaullogan1365

18 күн бұрын

my grocery store does unit pricing but 3 brands of the same product one will give price per serving, one price per ounce and the 3rd will give price per gram

@sabin97

16 күн бұрын

i do this all the time. particularly when buying rice. for some reason the larger packets of rice arent always cheaper per unit. sometimes it's cheaper per unit to buy 2 small packets than a large one....so i always do the maths.....numbers dont lie. "common sense" does.

@fifiwoof1969

16 күн бұрын

@johnpaullogan1365 clearly they hate customers by mixing up units. Luckily in Australia the units match so the comparison is VERY easy to compare!

I'm disapointed that you didn't use a short cut to calculate it: You don't have to calculate the /360 and the * π as they are both equal factors. So having to compare them you can just work with rational numbers: 6^2* 60 / 1.50 vs 7^2 * 45 / 1.70

@davesimms8825

19 күн бұрын

That’s how I did it.

@TFWPLSSUB

19 күн бұрын

That makes the number bigger though, 1/6 and 1/8 is just easier

@chrisschack9716

18 күн бұрын

The /360 is easy to deal with here, it just factors out so it's 1/6 or 1/8 ... and that 1/6 further cancels against the 6^2

@mynameisnotjeff4184

18 күн бұрын

Im disappointed a double integral wasn't used to calculate the area

I love your content, it is so good. It helps me so much since schools here aren't that great at teaching math Love from Brazil ❤

@sabin97

16 күн бұрын

es importante estudiar matematicas. yo hago este tipo de computos siempre que hago la compra, porque a veces sale mejor comprar paquetes pequen~os que grandes, de la misma cosa y la misma marca....

If math was taught with practical real life situations like this, no one would say they'll never use it outside of highschool.

I dunno. The 2nd pizza has more pepperoni.

@hemandy94

19 күн бұрын

That's why it is 20 cents higher

@werdwerdus

19 күн бұрын

of course it has more pepperoni, the total area is larger. the question is meant to measure value not absolute amounts

I'm glad we can instinctively tell that the 2nd one is slightly larger but not that large compared to the price difference

@gildedbear5355

17 күн бұрын

Humans are, generally, pretty bad at comparing tall and thin things with short and wide things. Though it's worse when dealing with volume since there's an extra dimension involved.

@sabin97

16 күн бұрын

i couldnt instinctively tell. i had to do the calculations. i dont trust "instincts" or "common sense". i trust numbers.

“OP did not mention, the 1.50 pizza uses cheese processed with almond milk from North Korea, whereas the 1.70 pizza uses marinara sauce made with soy from Taiwan.”

when i figured it out, i just left pi out of the area equations. the ratio between the two areas is still the same with or without it, but it meant i was able to do it all without a calculator. well, except for the very end when i had to calculate 6.125 divided by 1.7

Can you teach how to do the instant marker-swap techinique? Does it work with pens aswell?

@adipy8912

19 күн бұрын

Type "how to blackpenredpen" in the search bar

@inmuyataz

19 күн бұрын

It does, you just need to rotate it, u just use your index finger to push and use the one above. Well at least that's how i do it , i think there's different method of doing it since i just try to copy my friends long ago

@alexzaze1407

19 күн бұрын

@@inmuyataz a video tutorial would be nice for that

@adipy8912

19 күн бұрын

@@alexzaze1407 He already has a video about it: kzread.infogoMm-zD4tKA

@adipy8912

19 күн бұрын

@@alexzaze1407 He already has a shorts video about it. Search "how to blackpenredpen"

1st slice is 1/6 of a circle 2nd slice is 1/8 of a circle surface area is pi*r^2 1st slice: 36pi/6 in^2 2nd slice: 49pi/8 in^2 now just make the bottoms the same to compare the sizes 288pi/48 in^2 294pi/48 in^2 seems like the 2nd pizza is better? well, it's bigger by about 2% but it's more expensive by 12-13%, so the first slice wins unless you really hate the edge, then the 2nd pizza is better

A true mathematician would know that In the 4.5 minutes it took to figure out which pizza is cheaper and save 20 cents, you could’ve just worked an extra 4.5 minutes for federal minimum wage and had earned and extra 54 cents

You can vastly simplify since in calculating the area, pi is a common factor. Just square the length and divide by the number of slices you could slice (60 is 6 slices, 45 is 8 slices). You don't even have to consider price at that point because it will be apparent that the 7in pizza has marginally greater area but costs a lot more.

Now let's add the thickness. If the first pizza slice is 'thin and crispy' with thickness of 3/8 inch and the second is 'deep dish' with thickness of 1 inch.... lol

@dannyyeung8237

19 күн бұрын

Yeah thickness is important as well

@shaurryabaheti

19 күн бұрын

why not include the toppings count and crust width at the edges

@werdwerdus

19 күн бұрын

this and crispy will ALWAYS lose to total amount of pizza per price haha. it's like a cracker with sauce and cheese. but it's never any cheaper than hand tossed crust

@h4z4rd1000

19 күн бұрын

We were talking about Pizza here, deep dish is a garnished bread or tomato soup in a bread bowl, depending where you buy it, but not a pizza. :D

@daddymuggle

18 күн бұрын

​@@h4z4rd1000exactly. Thickness affects the deliciousness factor.

Actually, it did, but not in the way you might think. 6" slice has 7.5 pieces of pepperoni @ cost of $1.50. 7" slice has 8.75 pieces of pepperoni @ $1.70: 6" = $1.5/7.5 = $0.20 per slice of pepperoni, 7" = $1.7/8.75 =$0.19 per slice of pepperoni...7" slice is more cost effective at a penny less per slice of pepperoni. Cost of making pizza [manhours] is same regardless, cheese & sauce are fairly comparable across the two; pepperoni is most expensive ingredient on the pie. 8) Area of slice may be larger, but you're getting a more expensive meat topping.

@ABaumstumpf

19 күн бұрын

i would say it is only 8.5 slices on the 7" - so value for that, but everything else is more.

@R3LI2UI

19 күн бұрын

@@ABaumstumpf Point [tongue-in-cheek] was meant to show there's more to the calculus than sheer geometry; otherwise agreed. 8)

@werdwerdus

19 күн бұрын

that's fine if all you care about is maximizing total pepperoni. but that is obvious to see since the 2nd one has a larger total area. some of us prefer more crust so the first one wins in both price per unit area as well as more crust

holding on to pi until the final step is always more satisfying

"ah, but what of the crust-to-pie ratio?" me at 4am

@redslate

11 күн бұрын

This is important.

That is why sellers of pizza never gives you mathematical data for you to buy it in the wrong way Hahaha

I somehow decided to just use my math skills while lying in bed with post nut clarity. It felt nice to do math

@davidsantiago7808

12 күн бұрын

Play a game of chess before you sleep, it's fun to use your brain before sleeping.

@PoKeKidMPK1

11 күн бұрын

​​@@davidsantiago7808 then you lose without knowing why to someone who won without knowing why. then it didnt matter and now its the morning and your thinking about life after what ever occurs in the day.

@davidsantiago7808

10 күн бұрын

@@PoKeKidMPK1 or u win, but either way you experience a fun way to work the brain. Unless you're a sore loser you coudl have fun even if you lose, chess is just a game after all. The brain is a muscle, and a lot of people lack hobbies that stretch the brain. I am just saying it is healthy and relevant to the original comment

@PoKeKidMPK1

10 күн бұрын

@@davidsantiago7808 i dont think you do activities like chess often. it doesnt work that way, in even basic actions. googling info like that doesnt either because it creates beliefs. internet/supplements vs common good habits and purposeful testing worrying about being glorified on a random nights single chess game is also a hilarious self-brought contradiction to the point of learning.

@PoKeKidMPK1

10 күн бұрын

@@davidsantiago7808 you must not do activities like chess often then. it doesnt work that way, in even basic actions. you mind as well tell him to wake up, walk, breath, live life and it would be the same redundant idea. searching info like that doesnt either because it creates a fantasy. internet/supplements vs common good habits and purposeful testing worrying about whos being glorified on a random nights single chess game is also a hilarious self-brought contradiction to the point of learning.

plus as a high school dropout with terrible math skills, but knows pizza, the 60 degree cut will yield more crust per $/ square inch vs the 7 inch slice at 45 degrees.

Will be teaching this to my kids!

Calculator isn't necessary to compare both since both share the factor of pi/360° which you can ignore and compute the rest

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9 күн бұрын

Can I also do it??? My life is facing lots of challenges lately

As a lot of people here have pointed out, the crust is also important. In addition to that, the enjoynment of the crust matters too. Lets label that 'c'. The enjoynment of the rest would be 1 as in 100 %. Assume that the crust is 1 inch. The wide pizza has an area of A_wp = 1/6*π*5^2 = 25π/6 and the tall pizza has an area of A_tp = 1/8*π*6^2 = 9π/2 Crust is the remaining area. For the wide A_wc = 1/6*π*6^2 - 25π/6 = 11π/6 and for the tall A_tc = 1/8*π*7^2 - 36π/8 = 13π/8 Total food/enjoynment you're getting is f_w = (25+11c)/6 f_t = (36+13c)/8 Calculating the price per dollar for each gives us p_w = (25+11c)/6/1.5 = (25+11c)/9 p_t = (36+13c)/8/1.7 = (36+13c)5/68 Finally, lets see how much the crust enjoynment needs to be for each choice. (25+11c)/9 = (36+13c)5/68 68(25+11c) = 45(36+13c) 1700+748c = 1620+585c 80+163c = 0 c = -80/163 ~ -0.49 As we see, since the enjoynment needs to be a negative number (0 means no crust basically) so regardless of whether you like crust or not, you should get the wide piece.

This was the most important math problem i needed to learn. Thank you!

There are also other variables to consider, like the width of the crust, the overall thickness of the pizza slice, the weight of the toppings.

The better deal for me is always going to be the more narrow slice. I hate wide pizza slices almost as much as I hate a thick crust. I will pay more to not be annoyed 🍕

Proud that I worked this exactly the same way before watching it. I worry about forgetting things as I age, I'm happy to report I may not use it as much as I would like, but I still can!

In this particular example, as long as one knows that a circle is 360° in totality, one doesn't even necessarily need to know the (pi)(r^2) formula in order to figure out the solution. 60° = 1/6 of 360° and 45° = 1/8. 1/6 of the 6-inch-side is 1/1 (or 8/8), and 1/8 of the 7-inch side is 7/8. Now, without doing any (pi)(r^2) calculations, we can already see that they are selling the 8/8-proportion slice for $1.50 which is both larger (in proportion) and cheaper than the 7/8-proportion slice which is being sold for $1.70. So one doesn't even have to complete the extra-step of dividing the two different proportions by their correlating prices to know that the cheaper slice also has a larger area-for-cost-ratio making it the obvious choice for anyone who wants to "get more bang for their buck".

This is the dude who's already computing for his birthday cake's circumference on his 1st birthday my mom told me about when I was growing up. Jokes aside, thank you for contributing to society in a way most people would relate or be interested with which is food. With the newer generation being more and more technologically dependent, manual computation just gets thrown aside in favor of advanced calculators or would take things at face value like going for the 7" slice.

Just like high-school I quit paying attention pretty much right away and just waited for the answer. The original thought was the $1.50 slice

Maybe the Second is the better deal, because you get less crust which has no topping. The topping is the valuable part of the Pizza ;)

What if you are getting a pizza with a crust false advertising is rampant nowadays, and lets not forget the spacing of those add ons which can impact the taste and amount you are going to get.

My math is how many pieces of pepperoni am I getting over the other one. Which ever one has more I'm buying.

7" has more pepperoni slices, its enough for me.

Imagine doing the hard part of this problem then not dividing the price correctly.

It's cool that just looking with my eyes I could make the correct guess that the left slice was a better deal. There is also the factor of edge crust vs toppings, but it's not enough in this case to make the larger slice better.

Americans: problem with pizza Italians: How dare you call this a pizza !?!?

see this is a good math teacher, it all makes sense, down to the marker colors, red = variable, black = constant

These are the examples needed to teach math to students. It helps them understand a better deal, something they'll likely want to know. Plus, pizza.

it took me to tries to figure this out. first i wondered computing just the area of a slice, but since it's not exactly a triangle, that got complicated fairly quickly, i considered just ignoring the arched part, but then i thought of your method, using the radius and angle to compute the area based on the entire pizza. i agree with your result. and your analysis. and thus left a like and this comment. keep spreading maths. the world is a tiny bit better for your efforts.

My math skills are so bad that I got as far as figuring out that one pizza was $9 and the other was $13.60 without knowing how to apply that information or if it was even relevant.

It's better if you just grab a slice and carry on with how close both of these are. If I'm getting paid minimum wage of 7.25 an hour and I'm doing roughly 4:32 seconds worth of work. That comes out to roughly 54 cents of time to calculate this problem. So it costs more money to calculate the unit price of these two similar pizzas than the money you lose by randomly picking the slice of those two closely sized slices.

(7^(2)÷8)÷(6^(2)÷6) ≈ 1.021, so the long slice is aproximatly 2.1% bigger, but the price, is way bigger than that so i'd choose the phat slice.

"Lemme get a slice of pizza" "Sure, which one?" "Hold up lemme get my calculator"

Get area for both complete pizzas, as 60° is a 6th of a complete pizza A and 45° is a 8th of a complete pizza B, you can get both portion areas by dividing the area you need from a complete pizza, then its only a matter of dividing each area by its price to get the area of each of both pizzas that represents 1$, the higher value per $ is the better deal.

I always calculate if one large pizza is cheaper per area than two small pizzas to determine what to buy

I wish more people took stuff like this seriously. Knowing how to make good use of price/unit can potentially save you hundreds of dollars a month on groceries.

So good! As soon as I though of pizza I couldn't stop watching

This is why I always bring a kitchen scale so i dont have to do math for pizza.

I ran that into the triangle calculator. First slice has an area of around 15.5 and second 17.2. If you divide that with the price you get around a factor of 10 for both but you get slightly more with the first.

I prefer to do the area divided by the cost, because it basically tells you how much area of pizza you get for a dollar. In the first case it's 18.83/1.5 = 12.55 in^2 per dollar In the second case it's 19.25/1.7 = 11.32 in^2 per dollar The first case gives you more area per dollar, hence why it's better. This way also keeps it in line with how our caveman brains work, in that we consider the bigger number to be better :)

The $1.70 has less crust and looks like more pepperoni slices in thumbnail, that's additional value

As soon as food is involved, math is the most important topic of the day. More impressive even is that martini cone glass scam.

So interesting that you worked this out as $/in² when I would've never thought to express the cost as anything other than in²/$.

I use this same math to calculate “sale” prices versus regular prices at a grocery store.

Or... ~ 1/6 Pi 6^2 = 6 Pi ~ 1/8 Pi 7^2 = 6.125 Pi Option 1 : (6 Pi)/$1.50 = $0.25 per Pi ~ To provide the same value, the 7" slice would cost $1.533; as it actually costs $1.70, the 6" slice is clearly the superior value. Option 2 : $1.50 × 4 = $6 (making $ = Pi) ~ $1.70 × 4 = $6.80, which is clearly greater than 6.125; once again, the 6" slice is clearly the significantly better value. As this question is a simple comparison (which is the better value), all we need is a basic ratio between size and price. We don't even need to do precise calculations... Using Option 1, we know that the extra $0.20 at $0.25/Pi should provide 0.8 Pi more pizza for the same value vs the 0.125 Pi difference. There's no need to go any further in order to determine that the 7" slice offers less value than the 6" slice.

@yurenchu

16 күн бұрын

"... the 7" slice offers less value than the 6" slice." Judging from the image, the 7" slice offers about 8.5 round pieces of pepperoni while the 6" slice offers about 7 round pieces of pepperoni, so the 7" slice offers about 22% more pepperoni, for just a 13% higher price.

Assuming equal thickness, the left one gives you 12.56 pizza inches per dollar & the right one gives you 11.31 pizza inches per dollar.

If this was how teacher teach math at school i would have been a math wizard

Let’s say $1.5 is the standard price. To convert the left pizza to the right, $1.5*6=$9 since it’s 1/6 of a round pizza. Scale the size up of a 2 dimension shape, it will be $9*7*7/6/6=$12.25 . 45 degree is 1/8 of a round a round pizza so $12.25/8. Therefore the right one should cost $1.53125 according to the standard.

The 45° slice is actually a better buy, since the number of good bites is higher (outer 1.25” is crust and less desirable)

First one is bigger for sure, but a 60 degree pizza slice is a heresy.

Easier approach: first Pizza is 1/6 and second is 1/8 so whole pizzas cost: 9$ and 13,6$. r^2= 36 and 49. 9/36=0.25 13,6/49=0.27 smth. Therefore left is cheaper.

You saved my life, thanks

The 7" radius piece is a little bigger, but still slighty more expensive per square inch.

As a kid I would always win those school competitions where you'd guess how many beans were in a jar. I can look and just tell the left one, at that value, is better without doing any math. Area is almost identical, the price pushes it clearly in favor of the left one. I feel this problem would be a lot tougher for me to judge without the difference in price value.

Took me a second to realize you have two markers in your hand. I though it was a magic marker! 😂

This is the perfect example of a situation where math isn't the solution. Just ask how much each slice weighs, the heaviest is the biggest. 😂😂😂😂 (I'm kidding. I was a math teacher, math is important)

Thanks!

"-sir, are you going to order? There's people waiting, and please don't mess with the flavor of the day chart. -Yes, I will have a calzone and a soda. -Medium or large soda. -Humm..."

The math is great sure. But the way he juggles those whiteboard markers is something else.

I think the teacher wanted the answer with pi as a factor and using the unit square inches per dollar, because then the first slice would be 4πin²/$ against ~3.6πin²/$.

Man that was awesome

the left one looked bigger so i assumed that was the better deal and i was right, you did nothing for me

I think comparing the area per unit currency would have been a more intuitive way to compare the two, but this works too of course!

How does the ratio of crust to slice compare between those two?

So what cost would the larger radius option need to be in order to equal in value per area?