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Application of trigonometry part 2

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Application of Trigonometry Part – 2 16. The angle of depression of a car, standing on the ground, from the top of a 75 m high tower, is 30°. The distance of the car from the base of the tower (in m) is: (a) 25√3 (b) 50√3 (c) 75√3 (d) 150 Answer: c Explaination: 17. A ladder 15 m long just reaches the top of a vertical wall. If the ladder makes an angle of 60° with the wall, then the height of the wall is Answer: b Explaination: 18. The line drawn from the eye of an observer to the point in the object viewed by the observer is known as (a) horizontal line (b) vertical line (c) line of sight (d) transversal line Answer: c 19. The tops of two poles of heights 20 m and 14 m are connected by a wire. If the wire makes an angle of 30° with the horizontal, then the length of the wire is (a) 8 m (b) 10 m (c) 12 m (d) 14 m Answer: c Explaination: 20. If two towers of heights h1 and h2 subtend angles of 60° and 30° respectively at the mid-point of the line joining their feet, then h 1 : h2 = (a) 1 : 2 (b) 1 : 3 (c) 2 : 1 (d) 3 : 1 Answer: d Explaination: 21. The angle of elevation of the top of a tower from a point 20 metres away from its base is 45°. The height of the tower is (a) 10 m (b) 20 m (c) 30 m (d) 20√3 m Answer: b Explaination: 22. Two poles are 25 m and 15 m high and the line joining their tops makes an angle of 45° with the horizontal. The distance between these poles is (a) 5 m (b) 8 m (c) 9 m (d) 10 m Answer: c Explaination: 23. A portion of a ...
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