Question 1 Solution: True. Question 7 If the length of the shadow of a tower is increasing, then the angle of elevation of the sun is also increasing. Solution: False To understand the fact of this question, consider the following example. Question 8 If a man standing on a platform 3 metres above the surface of a lake observes a cloud and its reflection in the lake, then the angle of elevation of the cloud is equal to the angle of depression of its reflection.
Solution: False From figure, we observe that, a man standing on a platform at point P, 3 m above the surface of a lake observes a cloud at point C. Let the height of the cloud from the surface of the platform is h. If the height of the tower is doubled, then the angle of elevation of its top will also be doubled. Note : Teacher should explain about inverse functions for the given solution. Solution True Case i : Let the height of a tower be h and the distance of the point of observation from its foot is x.
Question 1 Solution:. Question 2 Solution:. Question 9 A ladder 15 metres long just reaches the top of a vertical wall.
Question 12 Show that Solution:. Question 13 An observer 1. Determine the angle of elevation of the top of the tower from the eye of the observer.
Find the height of the tower. Solution: Let the height of the tower be h. Solution: Given. Question 6 The angle of elevation of the top of a tower from two points distant s and f from its foot are complementary. Solution: Let the height of the tower is It. Question 8 A vertical tower stands on a horizontal plane and is surmounted by a vertical flag staff of height h. Find the distance between the two towers and also the height of the other tower.
Find the distance between the two objects. Question 17 A window of a house is h metres above the ground. Question 18 The lower window of a house is at a height of 2 m above the ground and its upper window is 4 m vertically above the lower window. Find the height of the balloon above the ground. Hence, the required height of the balloon from the ground is 8 m. Exercise 8. RD Sharma Class 12 Solutions. Watch Youtube Videos.
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