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On the level ground, the angle of elevations of a tower is 30° . On moving 20 m nearer, the angle of elevation is 60°. The height of the tower is

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On the level ground, the angle of elevations of a tower is 30° . On moving 20 m nearer, the angle of elevation is 60°. The height of the tower is

(a) 10 m (b) 10√3 (c) 15 m (d) 20 m

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Let AB be the tower and C and D be the points of observation such that

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