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January 29th, 2013, 01:45 PM   #1
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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?
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January 29th, 2013, 02:21 PM   #2
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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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