What is the length of the missing side of the triangle? *

15 is on the top, and 9 is on the left, there is the bottom side missing. I would really appreciate some help.

choices
12
17.5
144
306

2 answers

This theorem states that the sum of the lengths of any 2 sides of a triangle must be greater than the third side. This leads me to choose either 12 or 17.5. Any typos?
12