Pi or π is one of the most important mathematical constants, approximately equal to 3.14159. It represents the ratio of any circle's circumference to its diameter. It is pronounced as "pie". Many important formulas from mathematics, science, and engineering involve this so called magic number. A more accurate approxmation of this value is 3.14159265358979323846264338327950288419716939937510 ... but it keeps going and going. In fact, there are contests to judge who can recite Pi to to the longest decimal.
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