Melanie is making a piece of jewelry that is in the shape of a right triangle. The two shorter sides of the piece of jewelry are 9 mm and 12 mm. Find the perimeter of the piece of jewelry

First, find the length of the third side of the piece of jewelry by using the Pythagorean Theorem. Then, find the perimeter of the piece of jewelry by adding all the sides. And after doing all that your total answer should be 36mm