Some Applications of Trigonometry

This chapter applies the trigonometric ratios from the previous chapter to real-world problems of heights and distances. It introduces the line of sight, the angle of elevation and the angle of depression, and shows how to model a situation as a right-angled triangle and solve for an unknown height or distance using sin, cos and tan. It covers single-triangle problems, problems involving two triangles or two observers, angle-of-depression situations, and mixed real-life applications. Calculations rely heavily on the standard angles 30°, 45° and 60°. It is a high-scoring, application-focused chapter important for both CBSE and State Board examinations.