Question

Sorry if the image is blurry, I had no better lighting, but please help!

Answer 1

1 = a^2 + b^2 = c^2 rearranges to a^2 = c^2 - b^2 which means that a = sqrt(c^2-b^2)
2 = c^2 = a^2 + b^2 meaning that c = sqrt(a^2+b^2)

hope that makes sense