Art of Problem Solving

Art of Problem Solving

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== Solution is wrong ==

This solution is wrong.

Let AB=x.  Use [[power of a point]] to show that:

(1/18)/(1/18+2r)=(x)/(2x)=1/2

1/18=1/36+r

r=1/36.

The current solution makes its mistake when it uses law of cosines for the second time.

--[[User:Goos|Goos]] 21:41, 20 November 2009 (UTC)Goos

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