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, system.pi
is a function
which returns the value of π.
pi()/4
is the same as arctan(1)
.
See also
system.pi
system.arctan
calculates arc tangent.