pi = circumference/diameter
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Archimedes made pi more precise
pi was not made - it is not a human artefact. The ratio of the circumference of a circle to its diameter exists independent of human existence.
Pi Day, celebrated on 14 March every year, was made official in 2009. See the related weblink.
Pi
In statistics, pi represents the population proportion of successes. Using p, the sample proportion of successes, inferences can be made about pi, although it is usually unknown.