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.