The Babylonians probably didn't use "pi", as it is a Greek letter and I don't think the civilisations overlapped.
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Pi was first used by the Babylonians and Egyptians.
The Egyptians and the Babylonians are the first cultures that discovered Pi about 4,000 years ago.
The ancient Babylonians from around 1700 BC used pi = 3.125. The name of the person who calculated that value was not recorded.
In ancient Babylonian and Biblical times the value of pi was considered to be about 3
The babylonians first discovered the ratio compared to the diameter and circumference of a circle. Later, Archimedes(287-212BC) discovered and proved his theory of pi. Pi to 27 decimal places: 3.141592653589793238462643383 The square root of pi (to 30 decimal places) is: 1.772453850905516027298167483314