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### mrpopo says

The above answers all do a great job of answering in brief. I made a Hub on the subject and how to solve related questions, in case you want practice or more info.

### ianjonas says

The Pythagorean Theorem is a mathematical equation which can solve for any of the three sides of a right triangle. For a brief reading of this go to: http://hubpages.com/education/What-is-Pythagorean-...

### Addmin says

The Pythagoras Theorem is mostly used to find the longest side of a triangle. The formula for it is a^2 + b^2=c^2, where a and b are the length of two sides of a triangle, and c is the length of the hypotenuse (the side with the longest length).

Interesting

### KewlWriter says

For a RIGHT angeled triangle, the square of the hypotenuse[longest side] is equal to the sum of the squares of the other two sides.

if c is the longest side[hypotenuse]

a,b are two sides,

c^2 = a^2 + b^2

### ankigarg87 says

the Pythagorean theorem is a relation in Euclidean geometry among the three sides of a right triangle .According to this theorm In any right triangle, the area of the square whose side is the hypotenuse is equal to the sum of the areas of the squares whose sides are the two legs