Displacement Vectors finding magnitude of R and theta

AI Thread Summary
To find the magnitude of the resultant vector R and the angle θ it makes with the +x axis, start by applying the law of cosines, given the angle of 151 degrees opposite R. The relationship R = A + B indicates that you need to calculate the individual components of vectors A and B first. Once you have the components, use trigonometric functions to determine the angle θ. The angle of 29° is also relevant for resolving the vectors. This approach will lead to the correct values for R and θ.
mariner962
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Homework Statement



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
 

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Any ideas where to start?
 
I know that the angle of 151 degrees is opposite the resultant and that i can use the law of cosines.
 
actually i know that i have to find that angle using cosines
 

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