Circumference = Pi x d: 13 = 3.14 x 13 = 40.82 feet
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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).
Circumference of a circle = diameter x (pi) = 13 pi = 40.841 feet (rounded)
The radius of a circle with a circumference of 13 feet is: 2.069 feet.