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tangent Circles inscribed by square


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#1 BMAD

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Posted 16 December 2013 - 04:10 PM

All the circles and semi-circle are tangent to each other and are inscribed in a square. The 3 small circles are the same size, with radius r. R is the radius of the red circle. Prove that r = 3R/8

Edited by rookie1ja, 17 December 2013 - 09:39 PM.
new image to be added

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