Which equation can be used to find X, the length of the hypotenuse of the right triangle?

Pythagorean Theorum uses a^2 + b^2 = c^2

In that picture your legs will be 63 and 16 (aka a and b) ,so just input it and you’ll get c^2. In your case it’s x, so it will look like:

ANSWER:
63^2 + 16^2 = x^2
(last answer choice)

Aand b is what i think