Take the diameter (or twice the radius) and multiply by Pi.
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Circumference = pi*diameter or 2*pi*radius
EDIT: To find the diameter, using the circumference - you divide the circumference by the value of Pi - Snakester1962 (Supervisor)
Divide the circumference by 3.14159265 (3.14 for rough approximation) to find the diameter of a circle.
The value of pi = circumference/diameter
diameter X pi = circumference What you call edge is usually called circumference. pi = 3.1416