The line round the edge of the circle.
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If you are referring to the number that is used to describe the ratio of a circle's circumference to its diameter, then, yes, in terms of math it is spelled pi. Pi equals out to about 3.141529+ and goes on infinite (never ending).
The perimeter of a circle is its circumference.
Today in our math class, we had to find the circumference of a circle.
It is: circumference/diameter = pi
Circumference in terms of PI = 17 PI Circumference with 3.14 = 53.58 Area in terms of PI is 72.25 Area with 3.14 is 226.86500