Squares don't have radius... p.s. im a a*$*$*h*0*l*3 who doesnt know what im talking about...
It would be 6... good luck with that A+LS
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Area of the circle in square inches = pi*82
Circumference = 31.4 inches, approx. Area = 78.5 square inches, approx.
Pi x Radius x Radius = Area 3.1415 x 10 x 10 = 314.15 in^2 (for more accuracy, find more exact values of Pi)
First find the radius = 12/(2*pi) = 1.909859317 inches Area = pi*1.9098593172 = 11.4591559 or about 11.5 square inches
pi*radius2 = 100 square inches Making the radius the subject of the above equation gives it a value of 5.641895835 inches.