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Find angle S.

 

 Apr 27, 2020
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Assuming RS is a diagonal, then draw a line from the centre to T and you have an isosceles triangle.  The angle S (call it x) is the same as the angle between the line from the centre to T and that from T to S, so you have 2x + 48 = 180, from which you can find x.

 Apr 27, 2020

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