C=π x diameter (or twice the radius)
54 = π x d
d = 54/π
d=17.188733853924696263039446444232 in
r=d/2
r = 8.5943669269623481315197232221158 in
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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.
The radius of a circle with the circumference of 19.96 is about 3.18