Pre-Algebra

Here is the Pythagorean Theorem: a² + b² = c². It's a great way to solve for the unknown side of a right triangle. Basically, as long as you know two of the sides you can always find the third side, no matter which two you have. The down side is that it only works on right triangles.

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The Pythagorean Theorem is named after a Greek philosopher named Pythagoras who discovered it.