In the formula, a and b are the legs and c is the hypotenuse of a right triangle. Now let's take a look at the given triangle.
To find x we will write the equation according to the Pythagorean Theorem.
x^2+ 7^2= 9^2
Let's solve above equation. Notice that, since x is a side length, we will consider only positive case when taking a square root of x^2.
