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Sorry no computer to draw. You need to visualise. 

2nd picture, small unshaded triangle: X + 90 = 112 (ext angle of triangle)

x = 22

Then, open up the fold. You should see X + Y + Y = 90

y = 68/2 = 34

question like this usually needs kids to unfold to see the make up of angles.

ps: Hi Special-One, is this MO question? I see P5 standard SA2 on header of question paper….(?)

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post-20264

Supplement SAHMom’s answer with the diagram since she does not has a computer.  🙂 

 

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Wow! Nicely drawn! 

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Thank you!! Nice one! 👍🏻

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