Exploring the Pythagorean Theorem

Sal Khan from Khan Academy goes through several proofs of the Pythagorean theorem. What I particularly love about all of these is how geometric and visual they are. It might even be possible to do Bhaskara’s proof with a couple of squares of paper and some scissors, making it accessible to little kids with no concept of algebra.

President James Garfield’s proof using trapezoids

Bhaskara’s proof

Proof using similarity

Visual proof using parallelograms

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