For a circle:
circumference = 2 x π x radius.
As the diameter of a circle is 2 x radius:
circumference = π x diameter.
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the formula is: circumference= p*diameter
There is a constant relationship between the radius of a circle and its circumference. This is expressed in a formula.
In order to convert the area of a circle to the circumference of the circle, divide by the radius and multiply by two. The formula for the circumference of a circle is pi times the diameter.
Math
In order to calculate the circumference of a circle one must use a specific formula. The mathematical formula is C = D x 3.14. This translates to the circumference being equal to the diameter multiplied by 3.14, which is the equivalent to pi.