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Pi represents the ratio of the circumference of a circle to its diameter. If you know the diameter (D), then the circumference (c) is (D) *pi. If you know the circumference (C), then the diameter (D) is (C)/pi. circumference is 2PiR

R is the radius.

so 2R is twice the radius (a.k.a. The Diameter)

That leaves you with

Circumference=Diameter*Pi
The circumference can be found by multiplying the diameter by pi, and the diameter can be found by dividing the circumference by pi.

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Q: How do you get a circumference and diameter with pi?
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