Need help with this tricky problem

[Stonepoof]

need to solve this problem for A. The figure is not to scale. I realize I've to apply the cosine rule but am not able to figure out how to solve this.

 

[Stonepoof]

This is all the information provided in the problem. think of it as a top down camera in a 2D plane.

 

[Quaid]

am not able to figure out how to solve this

Please post one of your efforts, so that we can see something about what you've already tried.

 

[trinzed]

Is this problem seeking an algebraic expression as the answer, or an actual angle?

 

[mmm4444bot]

Is this part of some type of schoolwork (eg: homework, quiz or exam, project)?