Inscribed angle theorem proof | High School Geometry | High School Math | Khan Academy

Proving that an inscribed angle is half of a central angle that subtends the same arc. Created by Sal Khan.

High School Math on Khan Academy: Did you realize that the word "algebra" comes from Arabic (just like "algorithm" and "al jazeera" and "Aladdin")? And what is so great about algebra anyway? This tutorial doesn't explore algebra so much as it introduces the history and ideas that underpin it.

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[Angel-ggx]

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 !!!!

[daviddaasian]

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!!!

[ttd]

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

[Tusken]

Je suis française et je comprends mieux cette leçon que celle dans mon livre !! Merci

[jetpaq]

honestly ive learned as much algebra as I have geometry in these videos..the whole idea of " 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.!

[papagayin]

Oh, God, I never understood this at school... You make it look so easy!

[TheSunMessiah]

the only teacher on youtube which actually helps me pass exams and grading periods...thanks man

[vezzz]

Excellent teaching !!!! Makes understanding so easy !

[unknownperson]

Thank you our teacher never even taught us this lmao... but its going to be on the test...

[nickambrose]

love your videos they help me fall asleep thanks

[nayjer]

Great and slow explanation, after your explanation of the first case I got the other two.

[juanantoniobarragan]

Thank you so much for that clear demonstration

[saritdas]

Divine contribution for the students ❤❤❤❤❤❤

[ericcvt]

excellent very theoretical and straight to the poing

[JimmyRose]

8:00 How does the diameter prove that Si equals 1/2 Theta?

[jizzyq]

This man really out here drawing straighter lines with a mouse than i ever could with a ruler

[tsukiyakikid]

Thanks comrade, Many more students shall pass exams after quarantine thanks to you.

[theoyanto]

Very useful thank you, I didn't realise that geometry could be so interesting and informative

[judgenap]

Brilliant . understand it now. Thanks .

[indigobloo]

Omg thank you so much i have something due in a few hours and i havent even started