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
a2+b2=c2
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!
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The Best Pythagorean Rap ever!
Rock on Pythagoras