A right triangle has a hypotenuse of length 9ft and one leg of length 4ft. Using the Pythagorean Theorem, choose the equation needed to find the missing leg, x.


A. x^2 + 4^2 = 9^2

B. x^2 + 9^2 = 4^2

C. x^2 + x^2 = 13^2

D. 4^2 + 9^2 = x^2