Just double the radius. the diameter is twice the length. So if they radius is 5, then the diameter is 10.
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Diameter = 2*Radius
Radius is 1/2 of the diameter.
The radius is half diameter, so in your case the radius would be 1.5 inches.
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