Since
Circumference = 2πr
if the circumference is 9π
r = 9π/2π = 9/2 = 4.5
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If a circle has a circumference of 18pi, the radius is 9.
Circumference of the circle: 2*pi*9 = 18*pi cm
18 pi
Area = pi*92 Circumference = 2*pi*9
18 pi or 56.5486678