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All About Pi  A Breif History By defenition, pi is the ratio of a circumference of a circle and its diameter. The early Egyptians and Babylonians knew of pi's existence, though they didn't know its value nearly as well as we do today. The letter pi in Greek, pronounced like the "p" in our alphabet, stands for "perimeter". The Formulas Pi is used in many formulas. Here are some of the formulas. How to Calculate Pi In order to find pi, you must divide the circumference o a cirle and divide that by its diameter. ​ Fun Facts Pi is so big that you can find your birthday! If you want to find your birthday, check out the [|pi searcher].
 * C=2πr and/or C=πd -circumference of a circle
 * a=πr² -area of a circle
 * The surface area o a cylinder
 * The volume of a cylinder
 * The volume of a cone