Radius = Diameter/2
so if diameter = 20
Radius = 20/2 = 10
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circumference = pi*40cm
Radius = circumference/pi
Circumference of a circle: 2 x pi x radius.
to find the raduis of any circle, divde the diameter by 2. in this case, the answer would be 3.50
Well, if you know the diameter of the circle already, then you can divide it by half to get the radius. If you don't have the diameter however, then you simply have to find the middle of the circle and measure from the middle of the circle to the edge. That would be your radius.