Question 281602
Find the perimeter of the square in which a circle of area 81 pie is inscribed. 
A. 81
B. 40
C. 72
D. 9
E. 18 
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Find the radius of the circle:
Area = pi*r^2 = 81pi
r^2 = 81
r = 9
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The square has sides 2x that, = 18
Perimeter = 4*18 = 72