To which Greek mathematician is traditionally attributed the theorem (a² + b² = c²) for a right triangle?

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In a right triangle, the so-called Pythagorean theorem establishes that the square of the length of the hypotenuse is equal to the sum of the squares of the other two sides. Its reciprocal also makes it possible to determine whether a triangle is right-angled based on its lengths. Greek tradition associates this result with Pythagoras, a mathematician of the 6th century BCE, but no text from him is preserved. Babylonian tablets and Indian sources show that equivalent relationships were known before or independently of his school. It is therefore prudent to speak of traditional attribution rather than demonstrated individual invention.