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In every circle . . .

Area = (pi) x (radius)2

Diameter = 2 x radius

Circumference = (pi) x diameter

In this circle, Area = (pi) R2 = 81

R2 = 81/pi

R = sqrt( 81/pi )

Diameter = 2 x sqrt( 81/pi )

Circumference = (pi) x 2 x sqrt( 81/pi ) = 2 x sqrt( 81 pi ) = 18 sqrt(pi) = 31.9042 (rounded)

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