Angles in a circle pythagoras?

Can someone please help me?

BBC Bitseize has some good stuff on angle sin a circle:
17 June 2011
To help with this you must first be able to find the right angled triangle within the circle. Use your knowledge of circle theorems to do this. Normally the tangent will meet the radius at 90 degrees or the angle in a semi circle will form a right angle. Then its just a case of using pythagoras to find the necessary side.
19 June 2011
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