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The angle of elevation of the top of a tower from a certain point is 30°. If the observed moves 20 m towards the tower, the angle of elevation the angle of elevation of top of the tower increases by 15°. The height of the tower is
  • a)
    17.3 m
  • b)
    21.9 m
  • c)
    27.3 m
  • d)
    30 m
  • e)
    40 m
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The angle of elevation of the top of a tower from a certain point is 3...

Let AB be the tower and C and D be the points of observation.
Then, ∠ACB = 30°, ∠ADB = 45° and CD = 20m
Let AB = h then,

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