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Displacement Vectors finding magnitude of R and theta

  1. Sep 3, 2012 #1
    1. The problem statement, all variables and given/known data

    The displacement vectors A and B, when added together, give the resultant vector R, so that R= A+B . Use the data in the drawing and the fact that = 29° to find the magnitude R of the resultant vector and the angle θ that it makes with the +x axis.

    I am unsure how to find the magnitude of R and theta
     

    Attached Files:

  2. jcsd
  3. Sep 3, 2012 #2
    Any ideas where to start?
     
  4. Sep 3, 2012 #3
    I know that the angle of 151 degrees is opposite the resultant and that i can use the law of cosines.
     
  5. Sep 3, 2012 #4
    actually i know that i have to find that angle using cosines
     
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