Why Does the Pythagorean Theorem work?

All of us had, in one time or another, encountered the Pythagorean Theorem. A fundamental formula in Geometry, the theorem was first found stated in Babylonian text around 1900 BC. It was around 500 BC, however, that a proof to the theorem was discovered. Traditionally, Phythagoras, a famous Greek mathematician, was believed to have found [...]