The Pythagorean Theorem states that the square of the two short sides of a right triangle equals the square of the hypotenuse. It can be written a^2 + b^2 = c^2 and can be used with right triangles in order to find missing sides.
If you have the length of two sides of the right triangle, you can easily find the third.
In this demonstration of the Pythagorean Theorem with skittles you will see how the short side squared plus the other short side squared, equals the hypotenuse squared.
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