Either....
Halve the diameter; or
Divide the circumference by 2pi; or
Calculate the difference between the location fo the centre and the location of a point on the circumference.
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circumference = pi * 2radius (diameter) so to find radius you use circumference/(2 x pi) this will find radius ----
The diameter is twice the radius. So multiply the radius by 2
you find the radius of a cone by the bottom of it or the round part
the radius is half the diameter
When you have the radius of a circle and you are trying to find the diameter, multiply the radius by two; the answer is the diameter. If you have the diameter and want to find the radius, divide the diameter by two; the answer will be the radius. The diameter is 54 centimeters.