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Divide circumference by pi, that gives diameter. Radius is half of diameter
Circumference of a circle = 2*pi*radius or diameter*pi
pi X diameter finds the circumference so circumference divided by pi will leave the diameter. half the diameter to find the radius
The formula; 2 * Pi * Radius = circumference Will calculate the circumference of a circle.
You can either measure it, or calculate it if you know the diameter (radius = diameter / 2), or the circumference (radius = circumference / (2pi)).