Multiply the diameter by Pi (3.14) to find the circumference.
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circumference = 18*pi feet
Circumference = Pi x d: 18 = 3.14 x 18 = 56.52 feet
The circumference of a 128-foot diameter circle is: 402.12 feet.
The circumference of a six-foot diameter circle is: 18.85 feet.
The circumference of a 4 foot circle is: 12.57 feet(diameter x pi = circumference).