Some Egyptologists came to the conclusion after examining the Great Pyramid of Giza that the builders had knowledge of Pi and that it was used in the designs of the pyramid to incorporate the proportions of a circle.
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Pi was first used by the Babylonians and Egyptians.
Pythagoras was the 1st person who used the pi symbol first
Archimedes first used the symbol PI because he was the first one to discover it so he wanted to investigate about it.
The mathematician William Jones first used the Greek letter pi in 1706. In 1707, the great mathematician Euler popularized it.
The first digit of pi is 3, the first decimal is 1. Pi ≈ 3.14 The first fifty digits are 3.1415926535897932384626433832795028841971693993751