To find out the missing leg of a right triangle, you have to use the Pythagorean Theorem which is a^2 + b^2 = c^2. C is the hypotenuse. So, substitute the numbers into that equation.
2^2 + 4^2 = x
4 + 16 = x
20 =
2^2 + 4^2 = x
4 + 16 = x
20 =
