Trigonometry help!?

Question

this question I have no idea how to do so if you could help me please.

The second narrows in vancouver, British Columbia, is 3.4 km from Deep Cove on a bearing of 49 degrees. A boat leaves second narrows on a bearing of 261 degrees. after sailing for 1.3 km, the boat turns and travels 2.4 km to reach Deep Cove. to the nearest degree, in what direction is the boat now sailing?

Answer 1

This can be concluded to a triangle.Now suppose a=3.4,b=2.4,c=1.3 cosx=(3.4^2+2.4^2-1.3^2)/2*3.4*2.4 (Law of cosines)=16.72
270-261=9 90-9=81 so the answer=180-16.72-81=82.28