"Pi" is not an equation - it is a constant. Pi is irrational, that is, it cannot be expressed as a ratio of constants, but it can be truncated for common use (approximately 3.1415). Pi is given by the circumference of a circle divided by the circle's diameter:
Pi = C / d
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22/7=pi (roughly) 7 times pi is 21.99115 pi is 3.1415926535898 etc
perimeter = pi * diameter, or 2 * pi * radius
Pi, or 3.14159... Using the equation Circumference = pi * diameter.
circumference of a circle = 2*pi*radius or diameter*pi
in terms of pi- when using the symbol for pi instead of 3.14 or 22/7 in the end result of an equation