The circumference c of a circle is related to the radius r of the circle by the formula c = 2 X pi X r. Rearranging this formula leads to the equation r = c/2pi, or in this instance r is 67.5, to the justified number of significant digits.
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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