A Babylonian clay tablet has revealed that the Pythagorean Theorem was known over 1,000 years before Pythagoras.

Dating back to 1770 BCE, the tablet shows calculations using the theorem to find the diagonal of a rectangle — a clear sign that ancient Babylonians understood the principle long before the famous Greek thinker. Another tablet from around 1800–1600 BCE even shows they had knowledge of irrational numbers, like the square root of two.

So why is it still called the "Pythagorean Theorem"? Historians believe it’s because Pythagoras’ secretive school helped spread and popularize the idea, even if he wasn’t the first to discover it. Since no original writings from Pythagoras survive, much of what we know was likely passed down and credited to him out of tradition.

These ancient tablets are now changing how we view the history of math — showing that civilizations like Babylon were far more advanced than we once thought.

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