multiply radius by 2
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The radius is half of the diameter so you divide the diameter in half. (divide by 2) If your trying to find the diameter if you have the radius you double it (multiply by 2)
Divide the diameter by 2.
Multipy by 2 for the diameter
To find the diameter of a circle you multiply the radius by 2 or d=r2
Diameter = radius * 2 Circumference = pi * diameter.