Circumference is pi * diameter, or pi * 2 * radius, so if you are given circumference, then radius = circumference / 2 / pi. Pi is approximately 3.1416
Radius is from the center to the edge. Diameter is twice that (from one edge, through the center to the other edge). Radius = Diameter / 2, so if you're given Diameter, then just divide by 2.
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Divide the circumference by 2PI to find the radius. ( C = 2PI*Radius)
You times the radius by 2.
The diameter of the semicircle will be twice the radius.
The radius of a sphere is 1/2 of its height.
At first my friend, you haven't stated of what kind of body are you looking to find the radius.