The formula is 2 times radius times pi or the diameter times pi.
Circumference is 2r times pi.
Assuming you are referring to a circle.
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The formula; 2 * Pi * Radius = circumference Will calculate the circumference of a circle.
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
circumference = pi x diameter
by timesing the circumference by pie