The circumference is radius times two times pi.
C=2*pi*r
C=2*3*3.141592...
C=6*pi
C=18.849552
All numbers when multiplied are approximate because pi is an irrational
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Pi x R x 2 = 3.14 x 3 x 2 = 18.84cm
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 the circumference is 188.5, is 30.