The formula for finding the length of the hypotenuse is called the Pythagorean Theorem & is a^2+b^2=c^2. You take both legs & find their squares then add those together, Then you
find the root of your sum and you're done.
Answer: An equation
Step-by-step explanation: In math a equal sign put in between two expressions is called an equation. :)
The formula for the area of a square is a^2