2*pi*r = 31.4 units.
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The circumference of a circle if radius is 25 is about 157.1
157.079632679 :) you have to do the radius x 2 then times that by pi!
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