17. The angle of depression of two ships from the top of light house situated at 60 m height from sea-level, are 30° and 45° if two ships are on the same side of the light house then find the distance between two ships.
18. A 1.5 m tall boy is standing at some distance away from a 30 m high building when he moves towards the building then angle of elevation from his eye became 60° from 30°. Find how much distance he covered towards the building?
19. Angle of elevation of top of a tower from a 7 m high building is 60° and angle of depression of its foot is 45°. Find the height of the tower.
20. From the top of a hill, in east side at two points angle of depressions are 30° and 45°. If distance between two points is 1 km, then find height of the hill.
21. The Angle of elevation of a cloud from a 20 m above a lake (Point A) is 30°. If the angle of depression of its reflection from point A is 60° then find the distance of cloud from point A.
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