NCERT Mathematics Class 10 Exemplar Ch 8 Introduction to Trigonometry and Its Applications Part 3
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EXERCISE 8.3
1.
2.
3. If
4.
5.
.
7.
8. Find the angle of elevation of the sun when the shadow of a pole h metres high is h metres long.
Answer: 30°
9. If , then find the value of
Answer:
10. A ladder 15 metres long just reaches the top of a vertical wall. If the ladder makes an angle of 60° with the wall, find the height of the wall.
Answer:
11. Simplify
Answer: 1
12. If , then find the value of θ.
Answer: 90°
13. Show that An observer 1.5 metres tall is 20.5 metres away from a tower 22 metres high. Determine the angle of elevation of the top of the tower from the eye of the observer.
Answer:
15. Show that .