Everything About Circle Theorems – In 3 minutes!



This is a graphic, simple and memorable way to remember the difference from a chord or a tangent or a segments and sectors! I made this after struggling to understand it myself, once i got to grips with it i decided to help others who were also stuck.. so this video was created…

This video includes Perpendicular bisectors of any chord
the angles in a semi-circle,
what happens when a tangent and a radius meet,
Angles that are in the same segment and how different they are, the circumference subtended by the same arc,
the meaning of subtended,
lengths of two tangents and finally the angle between a tangent and a chord.. aka Alternate Segment Theorem.

I re-uploaded this video because the last one had some glitches so here we are againn….

FOR THE QUESTION IF YOU ARE STUCK
okay so angle A is 55degrees. this is because the whole isosceles triangle adds up to 180degrees, you now take 70degrees from this because the angle on the far right hand side is 70degrees. this leaves us with 110degrees and you divide it by two (due to it being isosceles triangle) so angle A is 55degrees.

if you go to 1:07 this explains the next part on why there is a 90degree angle on top of angle B.
 you take 55degrees from that 90degrees because part of the right angle overlaps the first isosceles triangle (on the right hand side) and we have previously worked out that, that angle is 55degrees, this leaves us with 35degrees.

now times that 35 by 2 which gives you 70degrees, take that answer AWAY from 180degrees because as you can see angle D is within ANOTHER isosceles triangle which means all the angles within the triangle add up to 180degrees.

because angle D is within that triangle, angle D and the angle at the bottom right of the Isosceles triangle will EQUAL to the same amount.
now divide the 110degrees by 2 to give you 55degrees.

Nguồn: https://katieeliselambert.com

Xem thêm bài viết khác: https://katieeliselambert.com/giai-tri/

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All Comments

  • MUST READ Number six in this video apears to be out of proportion and I did not realise. the arrow head shape MUST join in the centre of the circle not just anywhere. please note that the angle at the CENTRE of the circle is double that at the tip of the arrow.

    in the video it is slightly below the centre of the circle.

    EasiAsPi May 26, 2020 8:15 am Reply
  • Please can you do a video on circle theorem, I'm mostly confused

    Godwin Tudor May 26, 2020 8:15 am Reply
  • quickly watched this during my zoom call for maths tuition .

    dilini fernando May 26, 2020 8:15 am Reply
  • really helpfulll

    dilini fernando May 26, 2020 8:15 am Reply
  • the music is really disrupting

    Mr. Lion Fish May 26, 2020 8:15 am Reply
  • No shut up I aint got a exam tomorrow

    The Cat God May 26, 2020 8:15 am Reply
  • Currently, studying what I remembered from my Junior High lessons then hopefully I will pass another entrance exam.

    Black Mug May 26, 2020 8:15 am Reply
  • A video that must be seen and downloaded . Great job man !

    Bvks Sameer May 26, 2020 8:15 am Reply
  • Thanks Sir

    Borenyo Konwar May 26, 2020 8:15 am Reply
  • Helpful

    Aman Yadav May 26, 2020 8:15 am Reply
  • but like… how do we solve?

    Cptcrazy 345 May 26, 2020 8:15 am Reply
  • At 1:59, it cyclic not cylic

    Tanush goudar May 26, 2020 8:15 am Reply
  • Hello, I need a help from you. Can you prove that a cyclic parallelogram as a square? I have been trying it for some many months but I couldnt do it. Please help me

    Pranav Manoj May 26, 2020 8:15 am Reply
  • https://youtu.be/jmR8K62-HMw

    Chempulli School Of Mathematics CSM May 26, 2020 8:15 am Reply
  • I dont understand the last question about d.thanks sir!

    Saeed Pirzada May 26, 2020 8:15 am Reply
  • Corona took my GCSEs

    May - Bo this issa kool face May 26, 2020 8:15 am Reply
  • I wanna know about Euclidean circle geometry

    Francois Louis May 26, 2020 8:15 am Reply
  • https://youtu.be/wjA03PgwMeM

    Chempulli School Of Mathematics CSM May 26, 2020 8:15 am Reply
  • 4 min 11 sec and it says 3 min

    Fucking Koala May 26, 2020 8:15 am Reply
  • thanks! i learned absolutley nothing this whole unit and now i have a test

    kitty cat May 26, 2020 8:15 am Reply
  • whats the last one theorem?

    Moin Shaikh May 26, 2020 8:15 am Reply
  • Not 3 minutes, 4 minutes

    Izhan Shahid May 26, 2020 8:15 am Reply
  • how did you come up with this simplest form of solving circle therom

    David Sinyinza May 26, 2020 8:15 am Reply
  • epic expanation man , thanks❤
    just the voice wasn't clear and the music was adding to it.

    Movie Knight May 26, 2020 8:15 am Reply
  • The 1.2 k dislikes are people who failed the math test

    NeoSpyder V May 26, 2020 8:15 am Reply
  • I FINALLY UNDERSTAND CIRCLE THEOREMS!!!!!!!!

    marcypan May 26, 2020 8:15 am Reply
  • wait slowwwwww down 😂😂😂 I understood everything until you brought in arrows and screwed up squares 😂

    Amy Moo May 26, 2020 8:15 am Reply
  • Helpful but I'm probably will need a video that breaks it down fully☺

    Cordia Nevins. May 26, 2020 8:15 am Reply
  • Practice questions https://youtu.be/K-XlBqDwwJY circle ques for ssc cgl

    Vibha Uttam May 26, 2020 8:15 am Reply
  • faded

    Archi Priya May 26, 2020 8:15 am Reply
  • Invincible and Faded?

    NICE

    Manhal Eroth May 26, 2020 8:15 am Reply
  • its ticky but i'll get there

    Malcom Seva May 26, 2020 8:15 am Reply
  • This helped me out a ton on my a level revision thank you.

    The.Dio.Brando.Construction.Company May 26, 2020 8:15 am Reply
  • Thanks sir

    Amartya Arunima May 26, 2020 8:15 am Reply
  • Everyone here because of math exams but I'm here because our teacher sent this video for online school 😅

    Trashness May 26, 2020 8:15 am Reply
  • Wow the bgm is Faded!

    Soak Hing Lay May 26, 2020 8:15 am Reply
  • that make a no sense

    Keilworth Gaming May 26, 2020 8:15 am Reply
  • Number 8 : AB = AC WHEN B AND C ARE THE POINTS OF CONTACT WITH THE CIRCLE.

    Persand Kiran May 26, 2020 8:15 am Reply
  • You're going to fail your math test, just go watch some TV. Enjoy yourself. There's no reason to try. You're never going to use math in life. Trust me. You're wasting time by trying to studying. Stop stressing and get some rest.

    Wake Walker May 26, 2020 8:15 am Reply
  • No, i don't have an exam tommorow, Quarantine 🙂

    Isaac Wekele May 26, 2020 8:15 am Reply
  • Studying with the music of my fav song ❤️
    Best thing eveerr

    afnaan. agyl May 26, 2020 8:15 am Reply
  • thanks a lot this video helped me to fully understand the circle theorem.It was a bit challenging topic for me but now it's not

    Bethel Ntshonyane May 26, 2020 8:15 am Reply
  • Where's the Quarantine gang at?

    Annie Lawrence May 26, 2020 8:15 am Reply

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