Circumference=2Ï€radius (Ï€ is pi)
so...
C=2*π*9=18π≈56.549
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If a circle has a circumference of 18pi, the radius is 9.
Doubling the radius doubles the circumference.
A circle with a radius of 4.5 cm has a circumference of 28.27 cm
18 pi
If a circle circumference is 30 the radius is: 4.77