Divide the circumference by PI (3,14159...)
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Diameter = Circumference/pi
Circumference = diameter(pi) so divide the circumference by pi to get the diameter.
circumference/pi = diameter
If you have only the diameter to get the circumference you have to multiply the circumference by pi: 3.14
11 is a good approximation of the diameter. If the circumference is 35, the actual diameter is about 11.14 (35/3.1416).