   ABCD is a square with side length R. Find the radius of the red circle in terms of R?

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ABCD is a square with side length R. Find the radius of the red circle in terms of R?  posted Aug 14

(R - d)^2 = R^2 - (R/2)^2
(R - d) =√(3/4)*R
d = R(1 - (√3/2))
Radius of small circle = (R/2)(1 - (√3/2)). answer Aug 24

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