True or false, if false what would the correct term be?

Answer: False
To correct this, change "difference" to "sum"
In math, the term "difference" means we subtract two numbers or variable expressions. For example, 10x-5 is a difference. The term "sum" means we add two expressions, so something like x^2+5x is a sum.
The formula for finding the length of the hypotenuse (c) when given the legs a and b is this
[tex]c = \sqrt{a^2+b^2}[/tex]
We are taking the square root of the sum [tex]a^2+b^2[/tex]
This is based off the pythagorean theorem [tex]a^2+b^2 = c^2[/tex]