The formula is C = Pi x D where Pi = 3.1416 and D is the diameter. Using the formula: C = 3.1416 x 25 = 78.54 ft
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The diameter of a circle with a 12-foot circumference is about 3.82 feet. (circumference divided by Pi = diameter).
The circumference of a 8 foot diameter circle is about 25.13 feet.
The circumference of circle with 60-foot diameter is: 188 feet.
The circumference of a 30-foot diameter circle is: 94.248 feet.
The circumference of a five foot diameter circle is about 15.71 feet. (d x Pi = C)