To find the diameter of a circle you multiply the radius by 2 or d=r2
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you double the radius to find the diameter.
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.
The radius is half of the diameter so you divide the diameter in half. (divide by 2) If your trying to find the diameter if you have the radius you double it (multiply by 2)