divide the circumference by pie (3.14) and the answer would be the radius.
for example
circumference = 314
pie = 3.14
so 314 divide by 3.14 = 100 so the radius = 100
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If a circle circumference is 30 the radius is: 4.77
The circumference of a circle with a 2pi radius is: 39.58
The radius of a circle with a circumference of 59 is: 9.39
The radius of a circle if its circumference is 42 is about 6.68
A circle with a radius of 3.1cm has a circumference of 19.48cm