What Is Pi, and How Did It Originate? - Scientific American
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Tau Day is here: celebrate tau, not pi, as the true circle constant - The Verge
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pi - "name for Greek symbol representing the ratio of the circumference of a circle to its diameter; approximately 3.1416" by AcronymsAndSlang.com
Pi
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Is pi ([math]\pi[/math]) infinite? If it is, does that mean that the circumference or area of a circle is infinite too? - Quora
What does PI mean? - PI Definitions | Abbreviation Finder
