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Heights and Distances 637, , 15. A TV tower stands vertically on a bank of canal. From a point on the, C other bank directly opposite the tower, the angle of elevation of the top, of the tower is 60°. From another point 20m away from this point on the, , line joining this point to the foot of the tower, the angle of elevation of, , the top of the tower is 30°. Find the height of the tower and the width of, the canal., , _». The angle of elevation of the top of a building from the foot of a tower is, 30°. The angle of elevation of the top of the tower from the foot of the, building is 60°. If the tower is 60 m high, find the height of the building., , [CBSE 2013], , 17. The horizontal distance between two towers is 60 metres. The angle of, depression of the top of the first tower when seen from the top of the, second tower is 30°. If the height of the second tower is 90 metres, find, the height of the first tower. [Use V3 = 1.732], , The angle of elevation of the top of a chimney from the foot of a tower is, 60° and the angle of depression of the foot of the chimney from the top, of the tower is 30°. If the height of the tower is 40 metres, find the height, of the chimney., , —, a, , According to pollution control norms, the minimum height of a smokeemitting chimney should be 100 metres. State if the height of the above, mentioned chimney meets the pollution norms. What val, discussed in this question? [