Finding the missing angle in a regular polygon - quick test question 1

This video is all about finding the missing angle in a regular polygon and is aimed at around grade 4 GCSE Maths.

These types of questions appear in all the main examination boards, including Edexcel, AQA and OCR. They are popular and, once you have the basic principles, fairly similar. Please do stop the video, try the question and compare your solution!

PQ, QR & RS are 3 sides of a regular decagon. PRT is a straight line. Angle TRS = x degrees. Work out the value of x.

I hope the video helps and please do leave a comment - thanks!

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