Thank you so much, I have a big test today (nwea) and I did NOT know how to do it. This is gonna help me out alot.

@maxwehri9941

4 жыл бұрын

lmao what grade did you get

@g38jj53qofmt

4 жыл бұрын

max Wehri nope*

@piko5522

3 жыл бұрын

Me too lol

@memecream2075

2 жыл бұрын

What grade did you get

@albertbly1819

Жыл бұрын

Your welcome 🙏

This helped, didn't realize it was this easy!

Thanks for the info, helped a lot!

Nice explanation! I appreciate the help.

@danielschaben

3 жыл бұрын

Glad it helped!

It really helped a lot I was able to complete my work easily and faster than usual.

@briansolloway6354

3 жыл бұрын

Hi Mary, see my much simpler formula I have just posted. Let me know how you get on. B.

Thanks! I'm helping my son study for a test and this really clear things up.

@danielschaben

5 жыл бұрын

Glad I could help

Thank you that really clarified it for me :)

Thank you this is one of the last things I need to know for finals

@danielschaben

Жыл бұрын

You're welcome

Thanks so much I have been stuck in a question like this for hours

@danielschaben

3 жыл бұрын

You're welcome 😊

@jay2kawaii

Жыл бұрын

@@danielschaben thanks for helping me with my hw

Thank you a lot...this has helped me so much for my test today. Thanks again😀😊

@danielschaben

3 жыл бұрын

You're welcome

You are the man. Thank you

@danielschaben

Жыл бұрын

You're welcome

that was great thanks

Thanks for this, it really helped me because I'm really BAD at math.......

@danielschaben

5 жыл бұрын

practice, practice, and then you'll become good at math.😁 thanks for the comment

Thank you so ooo much!!!

@danielschaben

3 жыл бұрын

You're welcome!

salamat kaayu bay!! nice g

Thank you so much 😊

keep up the good content

@danielschaben

2 жыл бұрын

Thanks I will sure try.

Try this simple method, in only 3 calculations to get the answer. We used this in my office 65 years ago when we were calculating the area of a cross section of a tube. So imagine that your drawing is a tube. FORMULA = o/d minus gauge X Pi X gauge. o/d is the outside diameter of the tube. The gauge is what we called the thickness of the wall of the tube. So in your example the o/d would be 120 cm and the thickness would be 30 cm. So 120 minus 30 x Pi (3.14) x 30 = Answer 8478 sq. cm. So let me know what you think.

@danielschaben

3 жыл бұрын

I think I love it and will spend some time with it. Sorry this is such a late comment on such a thoughtful and interesting one. I am just figuring out how to work back through comments. I love the applications from people who actually use this. I farm, and so much of the math I teach, I also use, but very few kids see the point from textbook examples. Your comment gets to the point of why we need to learn this and how it is applied in the real world.

@briansolloway6354

3 жыл бұрын

@@danielschaben We used this method to find the strength of tubes. The tubes were made of aluminium alloy. The tubes were for fuel pipes in aircraft, irrigation pipes, scaffold poles and a 1000 and one other uses. They were made in various alloys depending on their application, so they were of various strengths depending on what they were to be used for. They were made to British Standards and Aircraft specifications, requiring a minimum strength in tons per sq. inch. So you needed to know the area of the cross section of the tube. The tube was tested to breaking point in a Tensile Testing machine. The breaking point in tons was then calculated per sq. inch. All these calculations were done on a slide rule, children wouldn't know anything about this nowadays. No calculators then. Hope you find this interesting.

Thanks

ahh...!! thanks for the help☻

Thanks for letting me learn this complicated skill when I'm Grade 4

@danielschaben

4 жыл бұрын

Your welcome

@Vampyrs__

3 жыл бұрын

Grade 4!? I’m learning this in grade 7 😂

@brandon9107

3 жыл бұрын

@@Vampyrs__ I know right 😭😭😂😂

30x30 is 900 but you didn’t multiply the pie with that can someone help me

cool

Thanks so much

@danielschaben

3 жыл бұрын

No problem

Did you use the pi's??????????

Thanx

Thx

And if all sides are equally

One more thing, what if the two radiuses are disconnected???

@danielschaben

7 жыл бұрын

Sorry I did not get this message in time. For some reason I am not getting notifications for all of my videos. Sorry I couldn't help you.

@xplo1611

3 жыл бұрын

awh ;(

Question and this is a problem with your method. What abut with decimals? I have a question to work our the shaded area, the larger circle has a radius of 4.1 whereas the smaller one has a radius of 1.7. Now this is where I am having a problem with your method, the answer has to be given to 3 significant figures. Now I can work out the areas of both circles thanks to Pi, however the resulting answer as a whole does not give me the availability to give the answer to 3 significant figures.

@danielschaben

5 жыл бұрын

(4.1)^2(pi)-(1.7)^2(pi) = 13.92(pi) so now just multiply13.92*3.1415 = 43.72968. So three sig figs would be 43.7. My method works nice so we can eliminate some of the rounding errors that occur by waiting to use the approximated pi until the end.

@danielschaben

5 жыл бұрын

And thanks for the comment! I love questions

Are we meant to mutiply the answer by 3.14 or leave the answer in 2700^?

@danielschaben

3 жыл бұрын

You can do either. Most of the time in a math class we leave answers in terms of pi

@ibunkunoluwaosideko856

3 жыл бұрын

@@danielschaben oh tnx

@danielschaben

2 жыл бұрын

@black berry what do you mean? Are you talking Interest? Stuff like That?

I'm studying right now and doing a question where the radius of the circles arent given. Only the tangent of the smaller circle where it hits the bigger circle. The distance between those 2 points are given. I have no idea how to do it. Any idea?!?!?

@danielschaben

3 жыл бұрын

I would love to see the picture

@danielschaben

3 жыл бұрын

Imagining it. You can probably connect a radius to the tangent to make a right triangle and use Pythagorean theorem in there somewhere is my guess

@dinahmite6038

3 жыл бұрын

@@danielschaben I just posted a 10 second video of the picture of it, if you want to look at it. I'm not sure if u can use pythagoras but I dont think so. It's in the chapter of trigonometry and the answer is in the back of the book if u want it but it doesnt tell how it's done. Thank you so much!

OMG thank you so much 7th grade ehriched is hard :D. Math isnt my strong area.

@danielschaben

3 жыл бұрын

YOU'RE welcome. So glad I could help. If you ever need a video done let me know. If I have time I love making them for good questions

don't you have to do 2700 x PI?

@danielschaben

4 жыл бұрын

many times the answer is left in terms of pi. This gives the exact answer. multiplying it by 3.14 will only give and approximation. So it really depends on the precision needed. maybe 3.1415 is needed or 22/7.

Hi thank you for your helpful video, how could i find the number of hectares in a circle with a diameter of 700 miles?

@danielschaben

5 жыл бұрын

pi*350^2 and then 1 square miles is about 259 hectares so multiply the number. so then multiply the 384845.10*259 = 99674880.9

@JFWILSON220

5 жыл бұрын

That's great thank you, I have wrote a story where there is a 700 mile circler area that I guesstimate at 100,000,000 hectares, it is one short story of 6 that I have wrote, and it was just making sure that was right before publishing my book of short stories.

@danielschaben

5 жыл бұрын

@@JFWILSON220 love it!!!!

Do I have to multiply with Pi?

@danielschaben

2 жыл бұрын

You can leave the answer in terms of pi in a math class, but if your building something real, you would have to multiply by some approximation of pi

I love you

@danielschaben

3 жыл бұрын

I know I liked this and loved it, but I think I love you too. LOL. Have a great one. Keep doing math.

What if only the radius of the small circle is given? How do you find the radius of the big circle?

@user-bn3uf3gx9w

3 ай бұрын

depends on what the relation between the two circles are

Thx for this im so bad at this now i know how to answer this kind of Problem But the problem asked to my assignment is the Radius is 7cm and then added more 7cm and the radius is now 14cm

@danielschaben

5 жыл бұрын

14*14*pi - 7*7*pi

how to derive the formulas of concentric circle??? That's my report on Friday...

@alfredocadionjr.7519

7 жыл бұрын

+Daniel Schaben thanks, but I'm looking for the derivation of the formulas π(R-r) , π(D-d)/4 and π L²/4..

I don’t understand how you got the answer I thought to work out an area of a circle is radius^ times pie (3.14) and to get the area of the shaded area You minus the area for the smaller circle 60^=3600x3.14=11,304 - 30^=900x3.14=2826 So it’s 11,304 - 2826= 8478 so how did you get the other answer

@danielschaben

5 жыл бұрын

I just left the answer in terms of pi. 2700*3.14 is the same as what you have.

@gloriakalengelayi8294

5 жыл бұрын

@@danielschaben Ok thank you for the reply

...so what's the area of the circle is the bigger portion measures r= 30 inches and the smaller part measures r= 40 inches?

@danielschaben

7 жыл бұрын

Well.... the bigger circle has to have a radius of 40 and the smaller circle would have to have a radius of 30. Look at your problem again. Are they giving you a diameter or d = 40 on the smaller circle. If that is the case then r = 30 for the larger circle and r = 20 on the smaller circle.

@cheesekuh8519

7 жыл бұрын

_lh3.googleusercontent.com/ZhixPqPj0xj6zGONWs8vbQuhi87oBUhIgLpa2qt85TTzEObZk9koaNHFgmWXmqFrREGBMHIJSw_

@danielschaben

7 жыл бұрын

cant open the link

@cheesekuh8519

7 жыл бұрын

_lh3.googleusercontent.com/-Q8SbF_JdEeaoolx-pvwn9-MjOAIBBUlT8ebqCcW7zHLcxx7CHP4-SJeMOaL4jZy1_xx16UY0g_

@danielschaben

7 жыл бұрын

Franchezkaichi Sendou what country are you from? Could you just paste the wording of the problem. I can't get either link to work and probably shouldn't click on links I'm not sure about.

can someone show me the the proper procedure

But what about the angle?

@danielschaben

6 жыл бұрын

In this case we are using the entire circle, so there is no need to worry about the central angle formed by the two radii. If area of sector is what you need, the do a search for area of sector. The area between two things is BIG AREA - SMALL AREA no matter what shape you deal with.

Hey guys its me Gio from paul w bell if u see this ily

lol channel tags are: Go, to, my, blog, for, more, info, at

Nice math

@danielschaben

5 жыл бұрын

thanks

Can you help me please I need the answer a question in general apilites,, we have two circles a one inside the other. The area of the big circle is 36 pi,, what it provided is that there is a short line which measure 2,, it's out from the border of small circle into the bigger one,, where can I send you the photo of it

@danielschaben

2 жыл бұрын

I think I know it from your description. You know the radius of the big circle is 6. Because the pi*r^2=36 pi. This means that your inner circle has a radius of 4. The area of this circle is 16pi. So the area of the shaded region between them would be 20pi. Because you would subtract them.

@user-ok4fv9jq5h

2 жыл бұрын

@@danielschaben yes yes this is answer,, but the teacher asked if there commen thing between them like a relationship or law that whenever I see a same question can answer it faster (we are supposed to answer every question in 1 min)

@user-ok4fv9jq5h

2 жыл бұрын

@@danielschaben I do appreciate your answer you don't know how it means to me

@user-ok4fv9jq5h

2 жыл бұрын

For example if once I see the question I know that the big circle area is twice of the small one (I know it's incorrect but Iam giving you an example to understand what I mean with a "faster relationship between them" and that I can do it with all questions with same provided informations

@danielschaben

2 жыл бұрын

@@user-ok4fv9jq5h square root the area of the bigger without pi sqrt(36)=6, subtract that number from your distance between circles 6-2 =4, square the 4 which is 16. Finally place back the pi and subtract. 36pi -16pi = 20pi

yesyesyesyesyesyesyesyesyesyesyesyesyesyesyesyesyes

I have depression!

@improbablythatpunchguyonyt7782

5 жыл бұрын

SAAMMEE

I dont understand why your putting Pi after u get ur answer its making me confused

@danielschaben

4 жыл бұрын

Great question. I'm just leaving pi out of the final calculation. If you take the number multiplied by 3.14 or some other approximation of pi, then you will have an approximate answer. Leaving pi there is just a way to show the exact answer. Now if your question is why is pi in the formula to begin with... well then... that truly is a great question.

@moevinny5168

4 жыл бұрын

@@danielschaben ok now I get it thanks

nononononoonononnonononnonononononononononononononononono

people who still need help and found this video 👇