The angles of a triangle sum to pi radians, or the angles at a point sum to 2*pi radians.
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Hipparchus
So soccer has the circle in the middle of the field. That is related to pi because it is a circle. That is how they are related!
Trignometry
Pi is related to the area of a circle because it just is. It is closely related to it in math, and to find the circumference (PI 3.14), you must know the area or the diameter.
Pi is related to the diameter of a circle through the circumference. C=(pi)*d C = circumference (perimeter of the circle) pi = constant d = diameter