you multiply the diameter by pi (d times pi = c)
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circumference of a circle = 2*pi*radius or pi*diameter
If you mean the diameter and radius of a circle given the circumference it is:- diameter = circumference/pi radius = circumference/(2*pi)
Diameter = circumference divided by pi you divide it by 3.14 (pi) and you have the answer!
(pi)D
Circumference of a circle = diameter*pi Diameter of a circle = circumference/pi