**What is Pi? | Pi Day**
https://www.piday.org/learn-about-pi/

What is Pi? “Probably no symbol in mathematics has evoked as much mystery, romanticism, misconception and human interest as the number pi” ~William L. Schaaf, Nature and History of Pi Pi (often represented by the lower-case Greek letter π), one of the most well-known mathematical constants, is the ratio of a circle’s circumference to its diameter.

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