Pi is first known to have been estimated in ancient Babylon about 4000 years ago. It was also used in ancient Egypt, and was discovered in India over 2000 years ago and China about 1500 years ago.
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the Ancient Myans
Additional mathematics is also called PI and was used in Ancient Egyptian civilizations. Pi helped the Egyptians plan the construction of the pyramids.
Pi can be used to find a circle, For the circumference-Pi x D, or for the radius Pi x r2
Greece. I think.
Pi isn't an invention, it's a definition. It is defined as the ratio of any circle's circumference to it's diameter. If anything, it's a discovery. Euclidean geometry, attributed by Greek mathematician Euclid was the first recorded system used to show Pi as a mathematical constant. Archimedes was a famous ancient Greek mathematician and inventor. He accomplished the computation of pi.