A circle.
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The line round the edge of the circle.
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).
There is no such thing or things as quardants in math terms. A quadrant, on the other hand, is either each of the four quarters of the Cartesian plane that is formed by the axes, or the four sectors of a circle formed by any two mutually perpendicular diagonals.
A line segment extending from the center of a circle or sphere t o the circumference or bounding surface.