Nice. I also like the proof which uses the only the first image a calculates the area of the square twice: c^2 + 4*a*b/2 = c^2 + 2*a*b (a+b)^2 = a^2 +

Nice. I also like the proof which uses the only the first image a calculates the area of the square twice: c^2 + 4*a*b/2 = c^2 + 2*a*b (a+b)^2 = a^2 + b^2 + 2*a*b