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Devac · 351 days ago · link · · parent · post: Pythagorean Theorem Found On Clay Tablet 1,000 Years Older Than Pythagoras
It's not the first one and what it does is illustrate completing the square. Using and proving are two different things, though. The 3-4-5 right triangle was widely used in what Herodotus called Ancient Egypt, but I'd be hella cautious about inferring they have done more than formulate it. It's an achievement, absolutely, just not as major.