So Marie Callendar's would have something to sell, NO SERIOUSLY!
The Egyptians used an approximation of Pi in the 20th century B.C. and probably used it for construction and building. It is often important to know the circumference of a circle and it is Pi times its diameter. They may have been the first to discover it.
A century later, the Babylonians used Pi. As time passed, the approximation they used improved.
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1706
Greece. I think.
dont worry about it
1.2411 trillion digits (1,241,100,000,000) digits of pi have been dicovered.
Every person who has ever used the "value" of pi in a calculation has used an approximation.