Pythagoras Theorem states that the square on the hypotenuse of a right angled triange is equal to the sum of the squares of the other two sides. In algebra
Here are some useful links for Pythagoras Theorem.
Why does it work? Read theProof
Video showing Pythagoras Theorem with water.
Pythagoras demonstration to the tune of Popcorn!
The Best Pythagorean Rap ever!
Rock on Pythagoras