Use the Pythagorean theorem. a^2 + b^2 = c^2 The 16.5 is c^2 because is not adjacent to the right angle and is the longest. So the problem is 9.2^2 + x^2 = 16.5^2. Once you square them you should get 84.64 + x^2 = 272.25. Then subtract 84.64 from 272.25 to get 187.61. Then you have x^2 = 187.61. Then you will need to get rid of the ^2 so square root both sides. Then you should get your answer of about 13.697. You should prob round this number though to the nearest 10th.
