# 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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Thank you!

Length of video = 11 minutes.

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### Ai Ling Ong

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! :)