If the circumference is 20 the radius is 3.18
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The radius of a circle whose circumference is 40pi is 20 units.
Circumference = 2*pi*r = 125.66 metres
The radius is 1/2 of the circumference.
If the circumference is 34.54, the radius is 5.497211734394065.
If the circumference of a circle is 351.68 the radius is: 56