Seshu cheera

  Class 10 CBSE Maths – Chapter 9: Some Applications of Trigonometry 🔹 Key Concepts ✅ Line of Sight A line drawn from the eye of an observer to the point being viewed. ✅ Angle of Elevation The angle between the horizontal and the line of sight when the point being viewed is above the horizontal level. ✅ Angle of Depression The angle between the horizontal and the line of sight when the point being viewed is below the horizontal level. 📘 Trigonometric Ratios Used In all questions involving height and distance, use these ratios: sin ⁡ θ = Perpendicular Hypotenuse , cos ⁡ θ = Base Hypotenuse , tan ⁡ θ = Perpendicular Base \sin\theta = \frac{\text{Perpendicular}}{\text{Hypotenuse}}, \quad \cos\theta = \frac{\text{Base}}{\text{Hypotenuse}}, \quad \tan\theta = \frac{\text{Perpendicular}}{\text{Base}} Most problems in this chapter use right-angled triangles and involve tan θ . 🧠 Important Notes: Always draw a diagram to represent the situation. Use t...