Lesson P11.04: Add and subtract vectors using components and right-triangle trigonometry. Original instructional visual. Central model: R_x=Σ A_x, R_y=Σ A_y, R=sqrtR_x^2+R_y^2. Key terms: component, resultant, trigonometry, bearing. The diagram is conceptual unless the lesson explicitly provides scale or measured data; all essential meaning is also stated in lesson text.