what is pythagorean theorem
Pythagorean theorem is a rule that states that the square of the length of the hypotenuse is equal to the sum of the squares of the other two sides. It is also called rule of Pythagorus.
The Pythagorean Theorem was one of the earliest theorems that was available to civilizations. It is still used in Geometry. More about the theorem can be viewed here: http://www.mathsisfun.com/pythagoras.html.