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pi = Cirumference C divided by diameter d. The circumference is the distance around a closed curve. Circumference is a kind of perimeter. Circumference of a circle
The circumference of a circle can be calculated from its diameter using the formula:
C = pi times d
Or, substituting the diameter for the radius:
C = pi times 2 r
where r is the radius and d is the diameter of the circle, and pi is defined as the ratio of the circumference of the circle to its diameter.
The numerical value of pi is 3.141 592 653 589 793...
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