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January 12th, 2012, 06:26 AM   #1
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Quadrilateral in a circle

Hello

I have a problem with a trigonometric question. I suppose that someone smart person can solve this problem better than i do.

A quadrilateral is in a circle. Show mathematically how sinA=(ad+bc)/(cd+ab).

I m grateful for respons
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January 12th, 2012, 06:52 AM   #2
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Re: Quadrilateral in a circle

http://www.cut-the-knot.org/proofs/ptolemy.shtml

Good old Google!
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