1. In geometry, a theorem stating that in a right triangle, the square of the hypotenuse (the longest side) is equal to the sum of the squares of the other two sides (legs). If the hypotenuse is c units long and the lengths of the legs are a and b, then c2 = a2 + b2. The theorem provides a way of calculating the length of any side of a right triangle if the lengths of the other to sides are known.

2. Something the Scarecrow from The Wizard of Oz was unable to correctly state even after he received his brains from the wizard.

A savage sexual position where the male contorts his body into the shape of a triangle while placing his foot onto the females head. Once in the "Pythagorean Theorem" position, he proceeds to viciously insert his erect phallus into her anus.

A little juicy formula that exposes the covert relationship between the sides in a right triangle—no other elementary mathematical result has excited so many people from all walks of life to try proving it from different angles.