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It means the circumference of a circle
I'm not sure what you mean. If the radius is 5, the circumference is 10pi. (about 31 and a half) If the circumference is 5, the radius is 5 divided by 2pi. (about four fifths)
I think what you're describing is the circumference.
Do you mean pi? pi = 3.1415926535 Circumference of a circle = pi*diameter
Radius of circle: 50.24/2pi = 7.995944341 or about 8 units