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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

  • @Angel-ggx
    @Angel-ggx9 жыл бұрын

    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

    @hannahjanz5119

    6 жыл бұрын

    Angel G if not can

  • @okaythenwhatever3573

    @okaythenwhatever3573

    6 жыл бұрын

    Angel G which not witch

  • @kolaajibola1929

    @kolaajibola1929

    6 жыл бұрын

    Hahaha!!!!

  • @xaimpo

    @xaimpo

    Жыл бұрын

    did it raise to a B?

  • @Angel-ggx

    @Angel-ggx

    Жыл бұрын

    ​@@xaimpo That was a comment 8yrs ago bro idk what happend.

  • @daviddaasian9685
    @daviddaasian9685 Жыл бұрын

    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!!!

  • @Tusken42
    @Tusken4211 жыл бұрын

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

  • @TheSunMessiah
    @TheSunMessiah7 жыл бұрын

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

  • @viaquabee

    @viaquabee

    Жыл бұрын

    oneshot fan detected

  • @unknownperson2973
    @unknownperson29737 жыл бұрын

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

  • @noelradhakrishnan4423

    @noelradhakrishnan4423

    3 жыл бұрын

    😂🔥

  • @ve2zzz
    @ve2zzz2 жыл бұрын

    Excellent teaching !!!! Makes understanding so easy !

  • @papagayin3
    @papagayin312 жыл бұрын

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

  • @nayjer2576
    @nayjer25762 жыл бұрын

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

  • @TPBHvideos
    @TPBHvideos12 жыл бұрын

    time to pass my geometry test!

  • @CarlosOAO

    @CarlosOAO

    3 жыл бұрын

    did you pass it ?

  • @Eng586

    @Eng586

    3 жыл бұрын

    Lol 9 years later sheesh

  • @user-sx1ed9oe9t

    @user-sx1ed9oe9t

    4 ай бұрын

    @@Eng58612 years later…

  • @nickambrose50
    @nickambrose505 жыл бұрын

    love your videos they help me fall asleep thanks

  • @iwannacommitjisatsu5858

    @iwannacommitjisatsu5858

    4 жыл бұрын

    Lmao

  • @prestidigitonuim_w.cheese
    @prestidigitonuim_w.cheese2 жыл бұрын

    this man is my childhood

  • @sanhitmaity7183
    @sanhitmaity71834 жыл бұрын

    A very good education platform...

  • @ttd972
    @ttd9723 жыл бұрын

    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

  • @jetpaq
    @jetpaq11 жыл бұрын

    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.!

  • @Gonzo01
    @Gonzo0111 жыл бұрын

    You make it so clear. Thanks!

  • @jizzyq106
    @jizzyq1063 жыл бұрын

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

  • @juanantoniobarragan9536
    @juanantoniobarragan95365 жыл бұрын

    Thank you so much for that clear demonstration

  • @ericcvt
    @ericcvt7 жыл бұрын

    excellent very theoretical and straight to the poing

  • @okaythenwhatever3573

    @okaythenwhatever3573

    6 жыл бұрын

    Life Worth Living yep, straight to the poing and pong

  • @AlexeyYunoshev
    @AlexeyYunoshev7 жыл бұрын

    Thanks a lot! It was very helpful

  • @indigobloo7441
    @indigobloo74413 жыл бұрын

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

  • @theoyanto
    @theoyanto Жыл бұрын

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

  • @tsukiyakikid8950
    @tsukiyakikid89504 жыл бұрын

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

  • @parikshituniyal
    @parikshituniyal5 жыл бұрын

    Theta and si...very intriguing

  • @judgenap
    @judgenap8 жыл бұрын

    Brilliant . understand it now. Thanks .

  • @browniesnofrownies4843
    @browniesnofrownies48436 жыл бұрын

    I don’t get how si and theta are confusing..???

  • @iwannacommitjisatsu5858

    @iwannacommitjisatsu5858

    4 жыл бұрын

    Si=x Theta=y

  • @ashvikgarg4913

    @ashvikgarg4913

    3 жыл бұрын

    i mean like your here aswel

  • @danielsayre6161
    @danielsayre616111 жыл бұрын

    Thanks for the help.

  • @henrrymendoza
    @henrrymendoza11 жыл бұрын

    Awesome explanation, geometry is beautiful!

  • @freddyyaniga
    @freddyyaniga8 жыл бұрын

    can you please just use x and y the si and theta thing is really confusing

  • @rashmibhardwaj1328

    @rashmibhardwaj1328

    6 жыл бұрын

    freddyyaniga studios true

  • @od3stroyer771

    @od3stroyer771

    5 жыл бұрын

    @Just Me lol no

  • @caitlincolter4919
    @caitlincolter49193 жыл бұрын

    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.

  • @JimmyRose1
    @JimmyRose19 жыл бұрын

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

  • @drevil37373
    @drevil3737311 жыл бұрын

    i wanted to make a psi joke but i dePSIded not to

  • @okaythenwhatever3573

    @okaythenwhatever3573

    6 жыл бұрын

    drevil37373 I was going to but you PSIched me out

  • @TheRealKayTrigga

    @TheRealKayTrigga

    6 жыл бұрын

    💀I wanna make math jokes

  • @ahmedwaly9073
    @ahmedwaly907310 ай бұрын

    Amazing

  • @SequinBrain
    @SequinBrain Жыл бұрын

    I've never seen this before. Surprisingly, it never came up in any of the math classes after geometry, which I somehow missed.

  • @cameronciarrachi436
    @cameronciarrachi4368 жыл бұрын

    Why do you hate X and Y?

  • @NatenguyenYT

    @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.

  • @oscardarla
    @oscardarla10 жыл бұрын

    I really hate circles, thank you youtube!

  • @jackdudar3982

    @jackdudar3982

    10 жыл бұрын

    thank you Khan

  • @lydianoronha522
    @lydianoronha5224 жыл бұрын

    Yes truly a good helpful one thanks #khans academy

  • @lixgaze9390
    @lixgaze93908 жыл бұрын

    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

  • @marekstefanecofficial
    @marekstefanecofficial3 жыл бұрын

    Thanks a lot!

  • @Rxhitkhatana
    @Rxhitkhatana3 жыл бұрын

    2010 version of Sal ... op mic btw

  • @gopikadas7674
    @gopikadas76744 жыл бұрын

    Ohhhhh this makes soooo much more senseeee

  • @franchezcavictorino
    @franchezcavictorino6 жыл бұрын

    I am confusion???¿¿¿?¿

  • @salsadsid
    @salsadsid12 жыл бұрын

    interesting work.. love you salman .. Great man not ever born.

  • @joedimon
    @joedimon3 жыл бұрын

    Love this proof

  • @catmanchester3847
    @catmanchester38473 жыл бұрын

    I would have liked some more real examples, like with numbers and solving for other angles

  • @moth36
    @moth363 жыл бұрын

    Nice proof

  • @sharljnst
    @sharljnst11 жыл бұрын

    Very good at explaining

  • @fashionablylate7463
    @fashionablylate74639 жыл бұрын

    What about with quadrilaterals instead of triangles

  • @shadybigfan
    @shadybigfan12 жыл бұрын

    should give us numbers with the examples

  • @hawimohammed6175
    @hawimohammed61757 жыл бұрын

    best best best best explanation keep it up

  • @Anomaly-bv2wn
    @Anomaly-bv2wn8 жыл бұрын

    this helped thnks

  • @kianawhite5793
    @kianawhite579312 жыл бұрын

    Very good....

  • @sullivannix4509
    @sullivannix45096 жыл бұрын

    I still dont get it

  • @vhfhdkfzu7317

    @vhfhdkfzu7317

    4 жыл бұрын

    Sullivan Nix noooooooo

  • @marchmelendez
    @marchmelendez5 жыл бұрын

    You have awesome handwriting

  • @sat2ap329
    @sat2ap32910 жыл бұрын

    good

  • @Android-jq6wd
    @Android-jq6wd8 жыл бұрын

    great video

  • @TakticalTekniq
    @TakticalTekniq12 жыл бұрын

    subtended...SUBTENDED...S-U-B-TENDED!!! LOL OKAY!!!!

  • @okaythenwhatever3573

    @okaythenwhatever3573

    6 жыл бұрын

    Timothy Grant thats why I subbed and I didnt know why

  • @maybeluca8027

    @maybeluca8027

    4 жыл бұрын

    the mystery

  • @zuzkhin4472
    @zuzkhin44722 жыл бұрын

    About to have a math test in 40 minutes lol

  • @MrMohsinkh
    @MrMohsinkh8 жыл бұрын

    I object sir............. fi 1 ias equal to fi 2 because they share the same chord........... kindly guide me.

  • @jibreelahmed6503

    @jibreelahmed6503

    8 жыл бұрын

    Yes si 1 and si 2 are the same and angles and they have the same arc

  • @Th30Hacker
    @Th30Hacker14 жыл бұрын

    AWESOME! Best man alive :D

  • @okaythenwhatever3573

    @okaythenwhatever3573

    6 жыл бұрын

    Th30Hacker Wait you r dead ;)

  • @abdulshakoor5782
    @abdulshakoor578211 жыл бұрын

    go nice work sir

  • @abdulkhadir4498
    @abdulkhadir44982 жыл бұрын

    My book says same arc which is so confusing!Thanks so much for the subtended arc lmao.

  • @Jaba6798
    @Jaba679811 жыл бұрын

    Genius

  • @CathyAnneable
    @CathyAnneable12 жыл бұрын

    thumbs up for hd

  • @ARN48411
    @ARN4841114 күн бұрын

    I wanted last proof

  • @socialelitist4256
    @socialelitist42568 жыл бұрын

    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

    @eyyayy8260

    2 жыл бұрын

    I know you made this reply 5 years ago, but I had a stroke trying to understand this.

  • @ahmedalbdairi4388
    @ahmedalbdairi438810 жыл бұрын

    i wish there's another way to explain this.

  • @dansp51
    @dansp5113 жыл бұрын

    sounds like frank zappa teaching geometry :)

  • @EnvyAbomination
    @EnvyAbomination14 жыл бұрын

    Wait isn't that angle at 5:03 supposed to be a linear angle too?

  • @richardswanson455
    @richardswanson4558 жыл бұрын

    just kidding really well explained. your very articulate

  • @roxsobad7
    @roxsobad713 жыл бұрын

    has any1 told y that u have awesome handwriting?

  • @jeonghanandeunwoosshalalal262
    @jeonghanandeunwoosshalalal2626 жыл бұрын

    Wait, what?! This is why I didn't want honors geometry...

  • @bBbKce
    @bBbKce6 жыл бұрын

    cool bro

  • @JennyBeCool
    @JennyBeCool6 жыл бұрын

    What programme do you use when you're drawing?

  • @ashvikgarg4913

    @ashvikgarg4913

    3 жыл бұрын

    it's their own software

  • @GndmMkv
    @GndmMkv14 жыл бұрын

    Sal. Even though this video help, it would been better if you state the theroem and postulate.

  • @okaythenwhatever3573

    @okaythenwhatever3573

    6 жыл бұрын

    Allen Deng no theorem fam just equations

  • @evibot4718
    @evibot47188 жыл бұрын

    WHO'S WATCHING THIS VIDEO IN 2008??????!!!!!!!!!!!!

  • @mspaint1615

    @mspaint1615

    8 жыл бұрын

    +Joseph Green "Uploaded on Mar 18, 2010" its 2019 dammit

  • @Luana_dm7qx

    @Luana_dm7qx

    8 жыл бұрын

    +fangirlninja lol

  • @FrankTehTank96
    @FrankTehTank9612 жыл бұрын

    His voice reminds me of Samuel L Jackson... O.O

  • @peterphilips5152
    @peterphilips51529 жыл бұрын

    *Not to scale

  • @fazzynone1
    @fazzynone17 жыл бұрын

    X and y is confusing

  • @kikachu2036
    @kikachu20362 жыл бұрын

    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.

  • @shiinamashiro6231
    @shiinamashiro62318 жыл бұрын

    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

    @pranavs5998

    3 жыл бұрын

    i know im 5 years late but lol idk

  • @jhonrayplays6881
    @jhonrayplays68816 жыл бұрын

    what app do you use

  • @DeanAnderson-dw2vk
    @DeanAnderson-dw2vk2 ай бұрын

    Oh yeah sigma😁😁😁🤣🤣🤣😂😂

  • @looks8727
    @looks87274 жыл бұрын

    yeah this is way too confusing tbh

  • @ming9935
    @ming99352 жыл бұрын

    Why do I still not understand…

  • @grzegorzg447
    @grzegorzg447 Жыл бұрын

    ima pretend i understood

  • @samkthegamer1017
    @samkthegamer10174 жыл бұрын

    im the newest comment here

  • @manasakaguchi
    @manasakaguchi6 жыл бұрын

    Me did the whole video: si.... theta.... wait how do your pronounce these... r.I.p x and y

  • @nfspayback1248
    @nfspayback12485 жыл бұрын

    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

    @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.

  • @jkgan4952
    @jkgan49523 жыл бұрын

    Smarrtt

  • @EileenTaylor1
    @EileenTaylor112 жыл бұрын

    oh god, this is 14 minutes

  • @okaythenwhatever3573

    @okaythenwhatever3573

    6 жыл бұрын

    Eileen Taylor oh god, a complainer

  • @Cypeq
    @Cypeq14 жыл бұрын

    THIRD!

  • @prafuljadhao3672
    @prafuljadhao36727 жыл бұрын

    Mahol

  • @priyabridgemohan2250
    @priyabridgemohan22504 жыл бұрын

    Plz stop saying si or thetha or whatever it is it’s confusing

  • @miravavillamin1595
    @miravavillamin15957 жыл бұрын

    he make it more confusing!!!!

  • @jerfersonmatos28

    @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 😂

  • @truhoes762
    @truhoes7629 жыл бұрын

    bro MLG

  • @SuperSmosh123

    @SuperSmosh123

    9 жыл бұрын

    How?

  • @fireball221000

    @fireball221000

    9 жыл бұрын

    DoritosDew get out

  • @nXusGFX

    @nXusGFX

    9 жыл бұрын

    +DoritosDew this made me lose braincells. im trying to do homework. not helpfull :(

  • @SuperSmosh123

    @SuperSmosh123

    9 жыл бұрын

    it is

  • @sanjitmnty1
    @sanjitmnty12 жыл бұрын

    Dear sir se padhana sikh

  • @King-wi4zq
    @King-wi4zq6 жыл бұрын

    Stop being a nerd and say X and Y or A and B

  • @bibi7043
    @bibi70433 жыл бұрын

    peen

  • @Lucy-hl9qg
    @Lucy-hl9qg8 жыл бұрын

    😂video not helpful at all

  • @jibreelahmed6503

    @jibreelahmed6503

    8 жыл бұрын

    Just listen carefully, take notes and try to understand what he is saying with an open mind.

  • @diabeticalien3584

    @diabeticalien3584

    8 жыл бұрын

    +sammy sammy Actually, yes it is. If you have trouble with this math, he explains it slowly and nicely.

  • @Dman82499

    @Dman82499

    8 жыл бұрын

    He did make it a little confusing subdividing the angles into random geometrical signs, though

  • @richardswanson455
    @richardswanson4558 жыл бұрын

    horrible explanation