can you help me with this question?
Use the Law of Cosines to solve the problem.

A ship travels due west for 83 miles. It then travels in a northwest direction for 111 miles and ends up 165 miles from its original position. To the nearest tenth of a degree, how many degrees north of west did it turn when it changed direction? Show your work.

Question

can you help me with this question?
Use the Law of Cosines to solve the problem. 
 
A ship travels due west for 83 miles. It then travels in a northwest direction for 111 miles and ends up 165 miles from its original position. To the nearest tenth of a degree, how many degrees north of west did it turn when it changed direction? Show your work.

anonymous · Answer

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hartnn · Answer

did you try this ? do you know the Law of cosines ?

anonymous · Answer

no
but i read it and don't understand it?

hartnn · Answer

here you need angle x , use law of cosines,
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$c^2=a^2+b^2-2ab \cos x$
just plug in a,b,c, values!