Question

How to find the hypotenuse of a triangle?

Answer 1

To find the hypotenuse of the triangle
you use the length of the legs
Plug it into the Pythagorean Theorem

so $a^{2} + b^{2} = c^{2}$

$a^{2}$  is one of the legs

and 

$b^{2}$  is the other leg

then 

$c^{2}$  is the hypothenuse