circumference = 18*pi feet
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Multiply the diameter by Pi (3.14) to find the circumference.
Circumference = Pi x d: 18 = 3.14 x 18 = 56.52 feet
The circumference of a circle with a diameter of 18 inches is 56.5 inches.
The circumference of a circle with a diameter of 18 metres is 56.5 metres, approx.
If a circle has a circumference of 18pi, the radius is 9.