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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: 2,881 Thanks: 1503  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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