BMAD Posted December 16, 2013 Report Share Posted December 16, 2013 (edited) 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 December 17, 2013 by rookie1ja new image to be added Quote Link to comment Share on other sites More sharing options...
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