There are several; for example the infinite series, pi / 4 = 1 - 1/3 + 1/5 - 1/7 + 1/9 ... This is not a particularly good series, since it converges slowly, but it is one of the simplest formulae for pi.
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22/7=pi (roughly) 7 times pi is 21.99115 pi is 3.1415926535898 etc
"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
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