Divide the circumference by 3.14159265 (3.14 for rough approximation) to find the diameter of a circle.
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Divide the circumference by the value of Pi - that will give you the diameter.
Circumference = pi*d. So d = Circumference/pi
Circumference of a circle: pi times diameter
The equation for finding the circumference of a circle is diameter times pi so reverse it to circumference divided by pi which leaves the diameter. The diameter is twice as big as the radius so divide the diameter by 2 and you will find the radius.
diameter = circumference/pi