They discovered many thousands of years ago that by dividing the circumference of any size circle by its diameter the answer will always be the same and that it is about 22/7 but nobody knows the exact value of pi even today.
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There is no recorded single discoverer of the value of pi. Although, it has been recorded that the Egyptians were aware of pi.
At around 1900 B.C., Egyptians estimated the value of pi to be 256 / 81 .
Pi was first used by the Babylonians and Egyptians.
Pi was created by Ancient Egyptians in 1706. Hope that helps! (:
The ancient Egyptians are believed to have used 22/7 which is 3.14285714...