Mahala 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 9mm and 12mm. find the perimeter of the piece of jewelry.

The two "shorter" sides are referring to the legs of the triangles, because the hypotenuse is the largest side. Looking at this, we can find that it's a 3-4-5 triangle, which means that the scaling factor is 3, because 9/3 =3, 12/3=4, meaning we multiply 5 by 3 to get 15.