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

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  • เผยแพร่เมื่อ 17 มี.ค. 2010
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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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ความคิดเห็น • 149

  • @Angel-ggx
    @Angel-ggx 9 ปีที่แล้ว +275

    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 ปีที่แล้ว +4

      Angel G if not can

    • @okaythenwhatever3573
      @okaythenwhatever3573 6 ปีที่แล้ว +3

      Angel G which not witch

    • @kolaajibola1929
      @kolaajibola1929 6 ปีที่แล้ว +1

      Hahaha!!!!

    • @xaimpo
      @xaimpo ปีที่แล้ว +1

      did it raise to a B?

    • @Angel-ggx
      @Angel-ggx ปีที่แล้ว +1

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

  • @daviddaasian9685
    @daviddaasian9685 ปีที่แล้ว +8

    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!!!

  • @unknownperson2973
    @unknownperson2973 7 ปีที่แล้ว +27

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

  • @Tusken42
    @Tusken42 11 ปีที่แล้ว +19

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

  • @papagayin3
    @papagayin3 12 ปีที่แล้ว +13

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

  • @TheSunMessiah
    @TheSunMessiah 7 ปีที่แล้ว +6

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

    • @viaquabee
      @viaquabee ปีที่แล้ว

      oneshot fan detected

  • @jizzyq106
    @jizzyq106 3 ปีที่แล้ว +1

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

  • @sanhitmaity7183
    @sanhitmaity7183 4 ปีที่แล้ว +3

    A very good education platform...

  • @nickambrose50
    @nickambrose50 5 ปีที่แล้ว +4

    love your videos they help me fall asleep thanks

  • @Gonzo01
    @Gonzo01 11 ปีที่แล้ว +6

    You make it so clear. Thanks!

  • @prestidigitonuim_w.cheese
    @prestidigitonuim_w.cheese 2 ปีที่แล้ว +2

    this man is my childhood

  • @TPBHvideos
    @TPBHvideos 12 ปีที่แล้ว +16

    time to pass my geometry test!

    • @CarlosOAO
      @CarlosOAO 3 ปีที่แล้ว +4

      did you pass it ?

    • @Eng586
      @Eng586 3 ปีที่แล้ว +5

      Lol 9 years later sheesh

    • @user-sx1ed9oe9t
      @user-sx1ed9oe9t 3 หลายเดือนก่อน +1

      @@Eng58612 years later…

  • @ve2zzz
    @ve2zzz 2 ปีที่แล้ว +3

    Excellent teaching !!!! Makes understanding so easy !

  • @juanantoniobarragan9536
    @juanantoniobarragan9536 5 ปีที่แล้ว +6

    Thank you so much for that clear demonstration

  • @ttd972
    @ttd972 3 ปีที่แล้ว +3

    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

  • @judgenap
    @judgenap 7 ปีที่แล้ว +3

    Brilliant . understand it now. Thanks .

  • @AlexeyYunoshev
    @AlexeyYunoshev 7 ปีที่แล้ว +4

    Thanks a lot! It was very helpful

  • @tsukiyakikid8950
    @tsukiyakikid8950 4 ปีที่แล้ว +1

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

  • @JimmyRose1
    @JimmyRose1 9 ปีที่แล้ว +8

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

  • @browniesnofrownies4843
    @browniesnofrownies4843 6 ปีที่แล้ว +17

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

  • @lixgaze9390
    @lixgaze9390 8 ปีที่แล้ว

    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

  • @indigobloo7441
    @indigobloo7441 3 ปีที่แล้ว +3

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

  • @jetpaq
    @jetpaq 11 ปีที่แล้ว +5

    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.!

  • @theoyanto
    @theoyanto ปีที่แล้ว +1

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

  • @nayjer2576
    @nayjer2576 2 ปีที่แล้ว +1

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

  • @danielsayre6161
    @danielsayre6161 11 ปีที่แล้ว +1

    Thanks for the help.

  • @parikshituniyal
    @parikshituniyal 5 ปีที่แล้ว +2

    Theta and si...very intriguing

  • @salsadsid
    @salsadsid 12 ปีที่แล้ว

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

  • @caitlincolter4919
    @caitlincolter4919 3 ปีที่แล้ว +2

    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.

  • @lydianoronha522
    @lydianoronha522 4 ปีที่แล้ว

    Yes truly a good helpful one thanks
    #khans academy

  • @ericcvt
    @ericcvt 7 ปีที่แล้ว +2

    excellent very theoretical and straight to the poing

    • @okaythenwhatever3573
      @okaythenwhatever3573 6 ปีที่แล้ว

      Life Worth Living yep, straight to the poing and pong

  • @Anomaly-bv2wn
    @Anomaly-bv2wn 8 ปีที่แล้ว

    this helped thnks

  • @marekstefanecofficial
    @marekstefanecofficial 3 ปีที่แล้ว

    Thanks a lot!

  • @SequinBrain
    @SequinBrain ปีที่แล้ว

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

  • @gopikadas7674
    @gopikadas7674 4 ปีที่แล้ว

    Ohhhhh this makes soooo much more senseeee

  • @oscardarla
    @oscardarla 10 ปีที่แล้ว +4

    I really hate circles, thank you youtube!

  • @freddyyaniga
    @freddyyaniga 8 ปีที่แล้ว +29

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

  • @joedimon
    @joedimon 3 ปีที่แล้ว

    Love this proof

  • @fashionablylate7463
    @fashionablylate7463 9 ปีที่แล้ว +1

    What about with quadrilaterals instead of triangles

  • @sharljnst
    @sharljnst 11 ปีที่แล้ว

    Very good at explaining

  • @Rxhitkhatana
    @Rxhitkhatana 2 ปีที่แล้ว +1

    2010 version of Sal ... op mic btw

  • @catmanchester3847
    @catmanchester3847 3 ปีที่แล้ว

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

  • @jhonrayplays6881
    @jhonrayplays6881 6 ปีที่แล้ว

    what app do you use

  • @kianawhite5793
    @kianawhite5793 12 ปีที่แล้ว

    Very good....

  • @hawimohammed6175
    @hawimohammed6175 7 ปีที่แล้ว

    best best best best explanation keep it up

  • @Android-jq6wd
    @Android-jq6wd 8 ปีที่แล้ว

    great video

  • @ahmedwaly9073
    @ahmedwaly9073 9 หลายเดือนก่อน +1

    Amazing

  • @Th30Hacker
    @Th30Hacker 14 ปีที่แล้ว

    AWESOME! Best man alive :D

  • @moth36
    @moth36 3 ปีที่แล้ว

    Nice proof

  • @EnvyAbomination
    @EnvyAbomination 14 ปีที่แล้ว

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

  • @henrrymendoza
    @henrrymendoza 11 ปีที่แล้ว +3

    Awesome explanation, geometry is beautiful!

  • @socialelitist4256
    @socialelitist4256 8 ปีที่แล้ว

    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 ปีที่แล้ว

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

  • @marchmelendez
    @marchmelendez 4 ปีที่แล้ว

    You have awesome handwriting

  • @abdulshakoor5782
    @abdulshakoor5782 11 ปีที่แล้ว

    go nice work sir

  • @sat2ap329
    @sat2ap329 10 ปีที่แล้ว +1

    good

  • @cameronciarrachi436
    @cameronciarrachi436 8 ปีที่แล้ว +15

    Why do you hate X and Y?

    • @NatenguyenYT
      @NatenguyenYT 6 ปีที่แล้ว +2

      Because My X wont get over me, she keeps saying she's "Sorry" but I blocked her eventually so its all gud.

  • @Jaba6798
    @Jaba6798 11 ปีที่แล้ว

    Genius

  • @JennyBeCool
    @JennyBeCool 6 ปีที่แล้ว +1

    What programme do you use when you're drawing?

  • @abdulkhadir4498
    @abdulkhadir4498 2 ปีที่แล้ว

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

  • @MrMohsinkh
    @MrMohsinkh 8 ปีที่แล้ว +1

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

    • @jibreelahmed6503
      @jibreelahmed6503 8 ปีที่แล้ว

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

  • @franchezcavictorino3830
    @franchezcavictorino3830 5 ปีที่แล้ว +3

    I am confusion???¿¿¿?¿

  • @CathyAnneable
    @CathyAnneable 12 ปีที่แล้ว

    thumbs up for hd

  • @dansp51
    @dansp51 13 ปีที่แล้ว

    sounds like frank zappa teaching geometry :)

  • @richardswanson455
    @richardswanson455 8 ปีที่แล้ว

    just kidding really well explained. your very articulate

  • @bBbKce
    @bBbKce 6 ปีที่แล้ว

    cool bro

  • @shadybigfan
    @shadybigfan 12 ปีที่แล้ว

    should give us numbers with the examples

  • @sullivannix4509
    @sullivannix4509 6 ปีที่แล้ว +9

    I still dont get it

  • @drevil37373
    @drevil37373 11 ปีที่แล้ว +21

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

  • @shiinamashiro6231
    @shiinamashiro6231 8 ปีที่แล้ว

    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 ปีที่แล้ว

      i know im 5 years late but lol idk

  • @zuzkhin4472
    @zuzkhin4472 2 ปีที่แล้ว

    About to have a math test in 40 minutes lol

  • @roxsobad7
    @roxsobad7 13 ปีที่แล้ว

    has any1 told y that u have awesome handwriting?

  • @TakticalTekniq
    @TakticalTekniq 12 ปีที่แล้ว +2

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

  • @jeonghanandeunwoosshalalal262
    @jeonghanandeunwoosshalalal262 6 ปีที่แล้ว +1

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

  • @ahmedalbdairi4388
    @ahmedalbdairi4388 10 ปีที่แล้ว +3

    i wish there's another way to explain this.

  • @kikachu2036
    @kikachu2036 2 ปีที่แล้ว

    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.

  • @FrankTehTank96
    @FrankTehTank96 12 ปีที่แล้ว +1

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

  • @peterphilips5152
    @peterphilips5152 9 ปีที่แล้ว

    *Not to scale

  • @fazzynone1
    @fazzynone1 7 ปีที่แล้ว

    X and y is confusing

  • @GndmMkv
    @GndmMkv 14 ปีที่แล้ว

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

  • @looks8727
    @looks8727 3 ปีที่แล้ว

    yeah this is way too confusing tbh

  • @DeanAnderson-dw2vk
    @DeanAnderson-dw2vk หลายเดือนก่อน

    Oh yeah sigma😁😁😁🤣🤣🤣😂😂

  • @ming9935
    @ming9935 2 ปีที่แล้ว

    Why do I still not understand…

  • @EileenTaylor1
    @EileenTaylor1 12 ปีที่แล้ว

    oh god, this is 14 minutes

  • @prafuljadhao3672
    @prafuljadhao3672 7 ปีที่แล้ว

    Mahol

  • @evibot4718
    @evibot4718 8 ปีที่แล้ว +1

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

    • @mspaint1615
      @mspaint1615 8 ปีที่แล้ว +1

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

    • @zahraa-dm7qx
      @zahraa-dm7qx 8 ปีที่แล้ว

      +fangirlninja lol

  • @manasakaguchi
    @manasakaguchi 6 ปีที่แล้ว +1

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

  • @Cypeq
    @Cypeq 14 ปีที่แล้ว

    THIRD!

  • @grzegorzg447
    @grzegorzg447 ปีที่แล้ว

    ima pretend i understood

  • @jkgan4952
    @jkgan4952 3 ปีที่แล้ว

    Smarrtt

  • @samkthegamer1017
    @samkthegamer1017 3 ปีที่แล้ว +1

    im the newest comment here

  • @nfspayback1248
    @nfspayback1248 5 ปีที่แล้ว

    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 ปีที่แล้ว

      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.

  • @priyabridgemohan2250
    @priyabridgemohan2250 4 ปีที่แล้ว

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

  • @truhoes762
    @truhoes762 9 ปีที่แล้ว

    bro MLG

    • @SuperSmosh123
      @SuperSmosh123 9 ปีที่แล้ว

      How?

    • @fireball221000
      @fireball221000 9 ปีที่แล้ว

      DoritosDew get out

    • @nXusGFX
      @nXusGFX 8 ปีที่แล้ว

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

    • @SuperSmosh123
      @SuperSmosh123 8 ปีที่แล้ว

      it is

  • @miravavillamin1595
    @miravavillamin1595 7 ปีที่แล้ว

    he make it more confusing!!!!

    • @jerfersonmatos28
      @jerfersonmatos28 6 ปีที่แล้ว

      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 😂

  • @sanjitmnty1
    @sanjitmnty1 2 ปีที่แล้ว

    Dear sir se padhana sikh

  • @bibi7043
    @bibi7043 3 ปีที่แล้ว

    peen

  • @King-wi4zq
    @King-wi4zq 6 ปีที่แล้ว +2

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

  • @aidensaroka7268
    @aidensaroka7268 6 ปีที่แล้ว

    The Si and theta stuff ruins the lesson for me. It makes zero sense, and doesn’t help me learn.

    • @dansam5467
      @dansam5467 6 ปีที่แล้ว +2

      Aiden Saroka 2 Psi and theta are just other names for angles you don't know. It's like substituting the letters x and y that you use to mark unknown values by other arbitrary letters.

  • @Lucy-hl9qg
    @Lucy-hl9qg 8 ปีที่แล้ว +9

    😂video not helpful at all

    • @jibreelahmed6503
      @jibreelahmed6503 8 ปีที่แล้ว +3

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

    • @diabeticalien3584
      @diabeticalien3584 8 ปีที่แล้ว +10

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

    • @Dman82499
      @Dman82499 8 ปีที่แล้ว +7

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

  • @richardswanson455
    @richardswanson455 8 ปีที่แล้ว +4

    horrible explanation