Divide the circumference by 3.14159265 (3.14 for rough approximation) to find the diameter of a circle.
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diameter = circumference/pi
You cannot find the diameter of something from its circumference unless it is a circle and, in that case, diameter = circumference/pi
Diameter = radius * 2 Circumference = pi * diameter.
diameter*pi = circumference
Diameter = circumference/pi