Posted by candace on Sunday, January 9, 2011 at 4:24pm.
Diameter = Length of a side. = X.
X^2 + X^2 = (Diag.)^2,
2X^2 = (Diag.)^2 = (20)^2,
2X^2 = 400,
X^2 = 200,
X = sqrt(200) = 14.14cm = Diameter.
r = 14.14 / 2 = 7.07cm.
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