My Math Forum Help in solving a circle question

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 January 29th, 2013, 01:45 PM #1 Member   Joined: Aug 2011 Posts: 78 Thanks: 0 Help in solving a circle question Question Points A, B, C and D lie in clockwise order on a circle. AB = 4cm, BC = 3cm and CD = 3.5 cm. AC is a diameter. Find the area of the quadrilateral ABCD. Sorry for being dull but I am terrible when it comes to questions like this. I know that as AB lies on the diameter that any angle drawing on it's diameter will be a right angle. Would someone please be able to sketch and explain how to go about answering this question? I know that Pythagoras will be involved at some point. Thanks but I really need to try and understand/practice these sorts of questions. Would it happen to be a trapezium?
 January 29th, 2013, 02:21 PM #2 Math Team     Joined: Jul 2011 From: Texas Posts: 3,002 Thanks: 1588 Re: Help in solving a circle question if AC is a diameter, then angle ABC is a right angle, as is angle CDA ; the quadrilateral is composed of two right triangles ...

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