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And not a right triangle in sight. I forget, did Pythagoras develop Pythagorean theorem or the law of sines?
When it came to taking credit ... he had all the angles covered
Well, he popularized it, but the Pythagoran theorem was something ancient civilizations had already figured out.
Documenter that documented their document gets the document credited to documenter
It's really just whose discovery spread the fastest. There have been a few instances in history where parallel discoveries happened, but it got named after the guy who got it popularized fastest.
Plus, the records of the civilization that discovered it were lost for a few millenia. But it's not the first thing that's been rediscovered a few times.