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Can somebody show I how to find the angle for FB,FG, angle GB,GF, angle GB,GC, angle GC,GH, angle CB,CG, angle CG,CH and angle HC,HG?
Not sure what you mean, since angles are customarily labeled with 3 points. If by the angle for FB,FG you mean the angle that FB makes with FG, then you know that
tan(AFB) = 12/15
tan(AFD) = 36/15
BFG = AFD-AFB
See what you can do with the others.