circumference = 2 x pi x radius which is the same as pi x diameter so the answer is pi.
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Pi (3.1415)
The circumference is equal to the diameter multiplied by Pi (about 3.1416):8 feet x 3.1416 = circumference of 25.1328 feet
Divide the circumference by pi, which is approximately equal to 3.14.
The circumference of a circle is equal to 2 x pi x radius, where "pi" is approximately 3.1416.
Approximately 50.26m, because circumference is equal to diameter times pi (or 3.1415). Or twice the radius times pi.