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HELP! Law of Cosines

  1. Sep 15, 2009 #1
    1. The problem statement, all variables and given/known data

    You walk 220.0 m due west, then turn 45.00 degrees toward north and walk another 50.00 m. how far and in what direction do you need to walk to get back to where you started?

    2. Relevant equations
    Law of Cosines


    3. The attempt at a solution

    I did the law of cosines to find the lenngth of side c. I used the angle measure of 135 degrees. I am not sure how to find the direction though. What degree is it?
     
  2. jcsd
  3. Sep 15, 2009 #2

    tiny-tim

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    Welcome to PF!

    Hi panthergk! Welcome to PF! :smile:

    YOu now have one angle and all three sides, and you want another angle …

    so use the sine rule. :wink:
     
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