Egyptians and Mesopotamians and babylonians
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The first written evidence that has been found of people finding the value of pi is in an Egyptian papyrus and Babylonian tablets about 1900 BC, however, some historians believe that the ratio of the perimeter to height of pyramids built in Egypt as early as 2613 - 2589 BC suggests that Egyptians already had made approximations of the value of pi at that time.
PI stands for polarization index. We need to find IR value(IR1) for 1min and again find the IR value(IR2) for 10min. PI=IR2/IR1
The first person to use pi is the awesome man Archimedes he was the first to compute pi's value accurately! I know this answer and I'm in 5th grade!:)
3.16 its right do not improve!!
The Hindus created PI