Video

Pythagorean theorem proof using similarity (Full video)

Khan Academy
Supporting grades: 8

Description: Proof of the Pythagorean Theorem using similarity. Created by Sal Khan. Now, we call the longest side of a right triangle, we call that side, and you could either view it as the longest side of the right triangle or the side opposite the 90 degree angle, it is called a hypotenuse. It's a very fancy word for a fairly simple idea, just the longest side of a right triangle or the side opposite the 90 degree angle. You're like, oh, they're just talking about this side right here, the side longest, the side opposite the 90 degree angle.

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