#17 so you would use the pythagorean's theorem a^2+b^2=c^2 so we know that a and b are both equal since the shape is a square so let's call them x and c would equal 26 so the equation would look like x^2+ x^2=26^2 2x^2=676 x^2=338 x= square root of 338 which is approximately 18.4
