Inscribed angle theorem proof | High School Geometry | High School Math | Khan Academy
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Proving that an inscribed angle is half of a central angle that subtends the same arc. Created by Sal Khan.
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Пікірлер: 150
not to offend my math teacher , but she never shows/explains us new subjects and gives homework and weekly quizes witch makes it really hard to raise/keep a high grade in her class, BUT ... Thanks to you , i always learn the subjects!!! , i went from a F to a D+, and my goals are to raise to a B , THANK YOU KHAN ACADEMY !!!!
@hannahjanz5119
6 жыл бұрын
Angel G if not can
@okaythenwhatever3573
6 жыл бұрын
Angel G which not witch
@kolaajibola1929
6 жыл бұрын
Hahaha!!!!
@xaimpo
Жыл бұрын
did it raise to a B?
@Angel-ggx
Жыл бұрын
@@xaimpo That was a comment 8yrs ago bro idk what happend.
As a 7th grader learning advanced math topics alone, it's not always easy to just read instructions in my textbook and fully understand the topic. But, thanks to Khan Academy, I can finally learn without any complications or confusion. Thank you so much!!!
Je suis française et je comprends mieux cette leçon que celle dans mon livre !! Merci
the only teacher on youtube which actually helps me pass exams and grading periods...thanks man
@viaquabee
Жыл бұрын
oneshot fan detected
Thank you our teacher never even taught us this lmao... but its going to be on the test...
@noelradhakrishnan4423
3 жыл бұрын
😂🔥
Excellent teaching !!!! Makes understanding so easy !
Oh, God, I never understood this at school... You make it look so easy!
Great and slow explanation, after your explanation of the first case I got the other two.
time to pass my geometry test!
@CarlosOAO
3 жыл бұрын
did you pass it ?
@Eng586
3 жыл бұрын
Lol 9 years later sheesh
@user-sx1ed9oe9t
4 ай бұрын
@@Eng58612 years later…
love your videos they help me fall asleep thanks
@iwannacommitjisatsu5858
4 жыл бұрын
Lmao
this man is my childhood
A very good education platform...
If you haven't watched the video yet, pause it at 3:40 and try to solve the rest yourself! It's a fun puzzle
honestly ive learned as much algebra as I have geometry in these videos..the whole idea of " prooving.....of "prooooooving" each answer( only you sal heads will get that joke.LOL) , he arms you with an insight thats hard to forget during its application. I really have much respect for his teaching ethic. Assume we know nothing( which is usually true) then show you everything but make it understandable..what a genius.!
You make it so clear. Thanks!
This man really out here drawing straighter lines with a mouse than i ever could with a ruler
Thank you so much for that clear demonstration
excellent very theoretical and straight to the poing
@okaythenwhatever3573
6 жыл бұрын
Life Worth Living yep, straight to the poing and pong
Thanks a lot! It was very helpful
Omg thank you so much i have something due in a few hours and i havent even started
Very useful thank you, I didn't realise that geometry could be so interesting and informative
Thanks comrade, Many more students shall pass exams after quarantine thanks to you.
Theta and si...very intriguing
Brilliant . understand it now. Thanks .
I don’t get how si and theta are confusing..???
@iwannacommitjisatsu5858
4 жыл бұрын
Si=x Theta=y
@ashvikgarg4913
3 жыл бұрын
i mean like your here aswel
Thanks for the help.
Awesome explanation, geometry is beautiful!
can you please just use x and y the si and theta thing is really confusing
@rashmibhardwaj1328
6 жыл бұрын
freddyyaniga studios true
@od3stroyer771
5 жыл бұрын
@Just Me lol no
I am sure if I was not so tired this would make more sense. I need a C+ in this class and I am struggling with a F. Guess I will be watching a lot more of your videos.
8:00 How does the diameter prove that Si equals 1/2 Theta?
i wanted to make a psi joke but i dePSIded not to
@okaythenwhatever3573
6 жыл бұрын
drevil37373 I was going to but you PSIched me out
@TheRealKayTrigga
6 жыл бұрын
💀I wanna make math jokes
Amazing
I've never seen this before. Surprisingly, it never came up in any of the math classes after geometry, which I somehow missed.
Why do you hate X and Y?
@NatenguyenYT
6 жыл бұрын
Because My X wont get over me, she keeps saying she's "Sorry" but I blocked her eventually so its all gud.
I really hate circles, thank you youtube!
@jackdudar3982
10 жыл бұрын
thank you Khan
Yes truly a good helpful one thanks #khans academy
Really nice video ... our maths teacher uses terms which makes it hard for me to understand thanks to u the concept is clear thank u Khan Academy
Thanks a lot!
2010 version of Sal ... op mic btw
Ohhhhh this makes soooo much more senseeee
I am confusion???¿¿¿?¿
interesting work.. love you salman .. Great man not ever born.
Love this proof
I would have liked some more real examples, like with numbers and solving for other angles
Nice proof
Very good at explaining
What about with quadrilaterals instead of triangles
should give us numbers with the examples
best best best best explanation keep it up
this helped thnks
Very good....
I still dont get it
@vhfhdkfzu7317
4 жыл бұрын
Sullivan Nix noooooooo
You have awesome handwriting
good
great video
subtended...SUBTENDED...S-U-B-TENDED!!! LOL OKAY!!!!
@okaythenwhatever3573
6 жыл бұрын
Timothy Grant thats why I subbed and I didnt know why
@maybeluca8027
4 жыл бұрын
the mystery
About to have a math test in 40 minutes lol
I object sir............. fi 1 ias equal to fi 2 because they share the same chord........... kindly guide me.
@jibreelahmed6503
8 жыл бұрын
Yes si 1 and si 2 are the same and angles and they have the same arc
AWESOME! Best man alive :D
@okaythenwhatever3573
6 жыл бұрын
Th30Hacker Wait you r dead ;)
go nice work sir
My book says same arc which is so confusing!Thanks so much for the subtended arc lmao.
Genius
thumbs up for hd
I wanted last proof
I have my gcse math exam at 27th and I understand a fair chunk of it. Watched the video twice, and I have a few questions: 6:41 if 2 Si equates 1 Beta, and if you take away the two, it equals zero, then why the hell is it half of Beta?! Or is it 0.5 x Beta? I see it recourring a multiple/factor (however you would call it), but shouldn't it be 2? Prominently at 14:02 shouldn't that formula be 2Si = 1Beta? This is messing with what I learnt from school, that a similar example of this, should 1Beta = 2Si, or 1Beta = Si x 2.
@eyyayy8260
2 жыл бұрын
I know you made this reply 5 years ago, but I had a stroke trying to understand this.
i wish there's another way to explain this.
sounds like frank zappa teaching geometry :)
Wait isn't that angle at 5:03 supposed to be a linear angle too?
just kidding really well explained. your very articulate
has any1 told y that u have awesome handwriting?
Wait, what?! This is why I didn't want honors geometry...
cool bro
What programme do you use when you're drawing?
@ashvikgarg4913
3 жыл бұрын
it's their own software
Sal. Even though this video help, it would been better if you state the theroem and postulate.
@okaythenwhatever3573
6 жыл бұрын
Allen Deng no theorem fam just equations
WHO'S WATCHING THIS VIDEO IN 2008??????!!!!!!!!!!!!
@mspaint1615
8 жыл бұрын
+Joseph Green "Uploaded on Mar 18, 2010" its 2019 dammit
@Luana_dm7qx
8 жыл бұрын
+fangirlninja lol
His voice reminds me of Samuel L Jackson... O.O
*Not to scale
X and y is confusing
I’m just trying to complete an 8 question quiz😃 and i’m tryna to not fail it yk…i’m too stupid for this and tired lmao.
What if there is another central angle? I don't know what to do :/ there are 2 central angles and 1 inscribed angle in my problem
@pranavs5998
3 жыл бұрын
i know im 5 years late but lol idk
what app do you use
Oh yeah sigma😁😁😁🤣🤣🤣😂😂
yeah this is way too confusing tbh
Why do I still not understand…
ima pretend i understood
im the newest comment here
Me did the whole video: si.... theta.... wait how do your pronounce these... r.I.p x and y
I dont get any of it ughughgughughughhgughguhugh!!!!!!!!!!!!!!!!!!!!!!!! I tried solving the questions yesterday and believe it or not , I spent 6 hours on this and till 12 pm , I rage quit!!!!!!!!!!!!!!!!!!!!
@EternalShadow1667
4 жыл бұрын
Nfs Payback you prob don’t get the background to it. Never give up, ik exactly what u mean, spent approx 2 days on nested fractions. Its ez now. Just put in the effort.
Smarrtt
oh god, this is 14 minutes
@okaythenwhatever3573
6 жыл бұрын
Eileen Taylor oh god, a complainer
THIRD!
Mahol
Plz stop saying si or thetha or whatever it is it’s confusing
he make it more confusing!!!!
@jerfersonmatos28
6 жыл бұрын
I think the whole idea is that is you make a triangle from the middle of the circle to two points of the circunference the angle of the triangle in the middle of the circle is gonna be twice of a triangle that take the same two point of the circunference but insted of parting from the middle parting from any place of the circunference. I'm sure nobody understood my explanation 😂
bro MLG
@SuperSmosh123
9 жыл бұрын
How?
@fireball221000
9 жыл бұрын
DoritosDew get out
@nXusGFX
9 жыл бұрын
+DoritosDew this made me lose braincells. im trying to do homework. not helpfull :(
@SuperSmosh123
9 жыл бұрын
it is
Dear sir se padhana sikh
Stop being a nerd and say X and Y or A and B
peen
😂video not helpful at all
@jibreelahmed6503
8 жыл бұрын
Just listen carefully, take notes and try to understand what he is saying with an open mind.
@diabeticalien3584
8 жыл бұрын
+sammy sammy Actually, yes it is. If you have trouble with this math, he explains it slowly and nicely.
@Dman82499
8 жыл бұрын
He did make it a little confusing subdividing the angles into random geometrical signs, though
horrible explanation