a formula that uses pi is the circumference and area of a circle and every polyhedron that has a circle
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"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
You can use it to build buildings, pools, and and if your boss gives you a mathematical equation, you can answer it.
Use the formula volume = (4/3) pi r3.
circumference of a circle = diameter*pi or 2*pi*radius