👉 The Pythagorean theorem, also known as Pythagoras' theorem, is a fundamental mathematical principle that states that in any right-angled triangle, the square of the length of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the lengths of the other two sides. This theorem is named after Pythagoras, who is credited with its discovery and proof. The term "pygmean" can be interpreted as a synonym for this theorem