**Case Study Questions for Class 10 Maths Chapter 9 Applications of Trigonometry**

**Question 1:**

A group of students of class X visited India Gate on an educational trip. The teacher and students had interest in history as well. The teacher narrated that India Gate, official name Delhi Memorial, originally called All-India War Memorial, monumental sandstone arch in New Delhi, dedicated to the troops of British India who died in wars fought between 1914 and 1919.The teacher also said that India Gate, which is located at the eastern end of the Rajpath (formerly called the Kingsway), is about 138 feet (42 m) in height.

(i) What is the angle of elevation if they are standing at a distance of 42 m away from the monument?

(a) 30°

(b) 45°

(c) 60°

(d) 0°

(ii) They want to see the tower at an angle of 60°. So, they want to know the distance where they should stand and hence find the distance.

(a) 25.24 m

(b) 20.12 m

(c) 42 m

(d) 24.24 m

(iii) If the altitude of the Sun is at 60°, then the height of the vertical tower that will cast a shadow of length 20 m is

(a) 20**√**3 m

(b) 20/**√**3 m

(c) 15/**√**3 m

(d) 15**√**3 m

(iv) The ratio of the length of a rod and its shadow is 1 : 1. The angle of elevation of the Sun is

(a) 30°

(b) 45°

(c) 60°

(d) 90°

(v) The angle formed by the line of sight with the horizontal when the object viewed is below the horizontal level is

(a) corresponding angle

(b) angle of elevation

(c) angle of depression

(d) complete angle