Circumference = Pi x d: 40 = 3.14 x 40 = 125.6 feet
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127.324 ft2
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).
The circumference of a 12-foot-diameter circle is 37.7 feet.