The diameter is twice the radius. So multiply the radius by 2
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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.
the radius is half the diameter
Diameter = 2*Radius
Take the circumference divided by pi to find the diameter and divide the diameter by two to find the radius.
Radius is 1/2 of the diameter.