The circumference of a circle equals pi times the diameter.
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Pi is, by definition, the ratio of a circle's circumference to its diameter. It follows that the circumference of any circle is pi times its diameter.
Pi (about 3.14...)
The ratio of the circumference of a circle to its diameter is know as PI. PI = 3.14159* = 22/7* This basically means that the circumference of a circle is a little over 3 times the length of the diameter. *Note that PI has an infinite amount of digits following it.
pi
PI:s a mathematical constant that is the ratio of a circle's circumference to its diameter.