The large triangle is an isosceles since both angles at the base each equal 42°. In an isosceles triangle the altitude z is at the same time median , then it bisects the opposite side in the middle . So w = 120/2 = 60
Now let's calculate z: tan 42° = (opposite side) / (adjacent side) = z/60 tan 42° = 0.9, 0.9 = z/60 and z = 54
