1. The problem statement, all variables and given/known data An air-traffic controller observes two aircraft on his radar screen. The first is at altitude 900 m, horizontal distance 19.0 km, and 25.0° south of west. The second aircraft is at altitude 1200 m, horizontal distance 17.6 km, and 17.0° south of west. What is the distance between the two aircraft? (Place the x axis west, the y axis south, and the z axis vertical.) 2. Relevant equations 3. The attempt at a solution my vectors for each airplane are: <17.22, 8.03, .9> <16.83, 13.18, 2.1> adding them together and then getting the resultant i get 36.57 kilometers, however thats wrong and i'm not sure what i did wrong.