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Pythagorean Theorem Found On Clay Tablet 1,000 Years Older Than Pythagoras
https://www.iflscience.com/pythagorean-theorem-found-on-clay-tablet-1000-years-older-than-pythagoras-70934
It predates Pythagoras by over 1,000 years.
A Babylonian tablet from around 1770 BC uses principles of the Pythagorean theorem, suggesting ancient Babylonians discovered it centuries before the famous Greek mathematician Pythagoras for whom it's named.