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June 16th, 2015, 07:28 PM   #1
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Semicircle and sines and many triangles wow

Hi! Im not sure how to finish this problem. I am attaching what I wrote until my brain crashed can you help me? Is the first part correct? Also I have no idea how to solve the second part.

Thanx!
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File Type: jpg semicircle.jpg (45.7 KB, 9 views)
File Type: jpg semicircle answer.jpg (12.2 KB, 8 views)
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June 16th, 2015, 08:24 PM   #2
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If $ABCD$ is a rectangle with the four points in that order on a circle and $AD$ is a diameter, the area of the rectangle is zero because the angle $\angle{ABD}= \angle{ACD} = 90^\circ$.
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