Since circumference is found by multiplying pi by the diameter of the circle, the diameter can by found using the inverse operation.
diameter = circumference/pi
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Divide the circumference by pi (3.141592......) to get the diameter.
Diameter = circumference divided by pi. (3.14159)
Diameter = circumference/pi Radius = circumference/2*pi
If you mean the diameter and radius of a circle given the circumference it is:- diameter = circumference/pi radius = circumference/(2*pi)
3.14 times the diameter