He is still doing problems with SOHCAHTOA, just advancing it a bit. We did a few practice problems to remind him of the process, then advanced it to a 30-60-90 right triangle and the relationship with the sides using trig functions, and solving for certain sides of a figure with multiple triangles. Then, I showed him what it means to 'solve a triangle' (finding all of the unknown sides and angles), and what an 'angle of depression' is.