Where C=circumference, r= radius and d=diameter To find circumference: C=2 x pi x r or you can use the formula C=pi x d To find diameter just multiply the radius by 2 if you know what the radius is. If you do not know the radius, but you know the circumference and need diameter use the following formula: C/pi=d Happy Computing!!!
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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).