Description: An elegant visual proof of the Pythagorean Theorem developed by the 12th century Indian mathematician Bhaskara. Created by Sal Khan. So let me see if I can draw a square. I'm going to draw it tilted at a bit of an angle just because I think it'll make it a little bit easier on me. So let me do my best attempt at drawing something that reasonably looks like a square.*Teacher Advisor is 100% free.