Multiply the radius by (2 x pi) to get the circumference.
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The circumference of a circle with a diameter of 7m is 21.98 m
If a circle circumference is 30 the radius is: 4.77
The radius of a circle with a circumference of 59 is: 9.39
The circumference of a circle with a 2pi radius is: 39.58
The radius of a circle if its circumference is 42 is about 6.68