My Math Forum the radius of the small circle O_2
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 November 18th, 2013, 04:06 PM #11 Senior Member     Joined: Feb 2010 Posts: 711 Thanks: 147 Re: the radius of the small circle O_2 $s$ = the side of the square $r$ = the radius By the Pythagorean Theorem we have $(s-r)^2 - r^2= (s+r)^2 - (s-r)^2$ Expanding and collecting terms gives 

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