(2π * 15)/2 I will assume that this is the appropriate equation. 2π*15 is the same as 30π. So this can be simplified to 30π/2 which is equal to 15π. Or about 47.12.
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Circumference equals the diameter times pi. The diameter is 2 times radius. Radius equals Circumference divided by pi then divided by 2.
Pi is basically the relationship between the circumference and diameter of a circle. (c/d). If you divide the circumference by the diameter you will always get pi, since C=Pi times d (or 2 times pi times radius), so circumference (C) divided by diameter (D) is Pi.
15
15 x (8/4) + 2 = 15 x 2 + 2 = 32
2/pi is about 0.6366197724