It wasn't thought of. It's just "the answer". People thought of 22/7
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The first digit of pi is 3, the first decimal is 1. Pi ≈ 3.14 The first fifty digits are 3.1415926535897932384626433832795028841971693993751
Pi was first used by the Babylonians and Egyptians.
The first eleven digits of pi are:3.141592653
3.1415926535897932384626433832795028841971693997510
pi = 3.14159265