Circumference of a circle divided by its diameter is equal to pi
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pi is the ratio of a circle's diameter (the distance across it) to its circumference (the distance around it).
The distance around a circle is its circumference
The ratio of the circumference of a circle to its diameter is Pi. (3.14159)
The ratio of the circumference of a circle to its diameter is Pi. (3.14159)
The ratio of the circumference to the radius of the circle is 2 times pi