A-Maths: Plane Geometry Question (Step-by-Step) [Video]


In this video, I will show you:

  • How to prove that 2 lines are // to each other
  • How to prove a pair of similar triangles
  • How to prove an equation involving length

Properties & Theorems used:

  • Angles in the same segment
  • Intercept Theorem
  • Corresponding angles
  • Tangent - Secant Theorem

Strategies (Used in manipulation in part iii) :

  • Breaking a longer length into smaller parts
  • 'Expansion' of length
  • Using result from earlier parts
  • Factorising common length

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Link to video: http://www.youtube.com/watch?v=UNZolJverww

Thank you!

Length of video = 11 minutes.

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Hi, I'm Ai Ling Ong. I enjoy coaching students who have challenges with understanding and scoring in 'O' Level A-Maths and E-Maths. I develop Math strategies, sometimes ridiculous ideas to help students in understanding abstract concepts the fast and memorable way. I write this blog to share with you the stuff I teach in my class, the common mistakes my students made, the 'way' to think, analyze... If you have found this blog post useful, please share it with your friends. I will really appreciate it! :)

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