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NDA2015MathematicsHeights and DistancesActual

The angle of elevation of the top of a tower from a point 20 m away from its base is 45^ . What is the height of the tower?

Options

  1. A10 m
  2. B20 m
  3. C30 m
  4. D40 m

Correct answer

B. 20 m

Step-by-step solution

In ABC , aligned & AB = h & BC =20 ~m & C =45^ aligned 45^ = AB BC 1= h 20 [ 45^ =1 ] array ll & h =20 ~m & Height of the tower =20 ~m & Option (B) is correct. array

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