Assuming you mean the Circumference of a Circle:
C = 2 x pi x Radius
or
C = pi x Diameter
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Circumference of a circle:Formula= diameter * pi (approx 3.14)
Circumference = (diameter) multiplied by (pi)
Divide the circumference by 2*pi because 2*pi*radius = circumference
The circumference is about 56.548 cmUse this formula for future calculations: diameter x 3.1416 (Pi) = circumference
pi*radius squared