a boat race...what's the angle?

dfunkyon3s

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A boat race involves 2 laps of a triangular course marked by buoys A, B, and C.
The race starts with the boats headed west for 3600 meters.
The other two legs of the course lie to the north of the first leg and their lenghts are, in order, 1500 meters and 2800 meters. Find the number degrees that the boat turns for the 5th turn on the course, to the nearest tenth of a degree.
 
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