It is the formula for finding the circumference of a circle which is the same as 2*pi*radius
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For any grade, the formula for circumference is as follows: C = Pi x D Where C=Cirucmference, Pi = 3.14159, and D = Diameter
Using the formula for circumference, the diameter can be found. The formula is C = Pi x D where Pi = 3.1416 and D = Diameter. C = Pi x D (sub with known numbers) 25.12 = 3.1416 x D (divide both sides by Pi) 25.12 ÷ 3.1416 = D 7.9959 = D
pi * d
(pi)D
C= pi * D This is the formula for circumference.