Find the value of x in the diagram below.

tan 60  =  opp/ 1     opp = left side = 1.732

Dashed line        = adj / hyp   = cos 60

                                1/ cos 60 = 2 = dashed line              

Then the L upper angle in the larger triangle is 60 degrees      cos 60 = 2/x      then  x = 4