1. Solving right triangles involves sketching the triangle, identifying given and unknown parts, and using trigonometric functions, the Pythagorean theorem, or angle relationships to calculate unknowns. 2. Angles of elevation are formed between an observer's line of sight above the horizontal, while angles of depression are below the horizontal. These can be used to calculate heights or distances. 3. Bearing is the acute angle from north or south, while course is the clockwise angle from north along the line of travel. These specify directions.