Due to the Pythagorean Theorem, the answer will be the square root of 500. Because the Pythagorean theorem says a^2 + b^2 =c^2 so this means 10^2 + 20^2 = c^2 So 100 + 400 = 500. Now we need to find the square root of 500 to find C. So the square root of 500 is 22.36
