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January 12th, 2012, 06:26 AM  #1 
Newbie Joined: Jan 2012 Posts: 1 Thanks: 0  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 
January 12th, 2012, 06:52 AM  #2 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1038  Re: Quadrilateral in a circle 

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