Circumference equals 2 x the radius x pi.
4(2) = 8
So, the circumference is 8 pi. However, if you want to calculate the actual value, multiply those two together and you get roughly 25.1.
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A circumference of 12.57 cm
If a circle has a circumference of 43.98 the radius is: 7 (6.999).
If a circle has a circumference of 16 cm then the radius is about: 2.546 cm
The radius of a circle with a circumference of 30 inches is: 4.77 inches.
The radius of a circle with circumference of 63 m is 10.03 m