The ancient Egyptians are believed to have used 22/7 which is 3.14285714...
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At around 1900 B.C., Egyptians estimated the value of pi to be 256 / 81 .
There is no recorded single discoverer of the value of pi. Although, it has been recorded that the Egyptians were aware of pi.
The Egyptians and the Babylonians are the first cultures that discovered Pi about 4,000 years ago.
Archimedes (287-212 BC) was the first to have had a serious attempt at calculating pi.
The ancient Babylonians from around 1700 BC used pi = 3.125. The name of the person who calculated that value was not recorded.