Basic statics problem, but I don't know how to solve it.?

 

Cable OA is used to support column OB and the attached pipes, OC and OD.

  

Given:   

  L1 = 10 ft,   L2 = 12 ft,   L3 = 12 ft,   θ = 25°   

Find:  

The angle Φ that pipe OD makes with cable OA,

What are the steps to solve this? I just can't seem to figure it out.

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