The earliest signs of the use of Pi was in the designs of the Old Kingdom pyramids in Egypt. Many divide the history of Pi into three periods: The ancient period during which Pi was studied in a geometrical manner, the classical era when Pi was fully developed after the creation of calculus in the 17th century and, most recently, the age of digital computers.
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pi = circumference/diameter
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