Pi
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π (greek letter pi) is the ratio of the circumference of a circle to its diameter.
π is about 3.14159265358979.
A full circle has 2*pi() radians.
In Free Pascal's RTL, system.pi is a function which returns the value of π.
This allows you to assign addr(system.pi) to a procedural variable.
pi()/4 is the same as arctan(1).
See also
system.pisystem.arctancalculates arc tangent.
