The circumference of a circle if the radius is 18 is: 113
i have the same question and its multiple choice and none of the choices say 113! :((
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If a circle has a circumference of 18pi, the radius is 9.
18/(2*pi) = a radius of about 113.09
Circumference of a circle: 2*pi*radius or diameter*pi
A circle with a radius of 18 inches has a circumference of 113.097 inches.
The radius is 18.