Class X

At a point 20 m away from the foot of a tower the angle of elevation of the top of the tower of 30ᵒ.The height of the tower is
  1. 20√3m
  2. (20/√3)m
  3. (√3)/(20)m
  4. None of these
The angle of elevation of a ladder leaning against a wall is 60º and the foot of the ladder is 4.6 m away from the wall. The length of the ladder is:
  1. 2.3 m
  2. 4.6 m
  3. 7.8 m
  4. 9.2 m
From a point P on a level ground, the angle of elevation of the top tower is 30º. If the tower is 100 m high, the distance of point P from the foot of the tower is:
  1. 149 m
  2. 156 m
  3. 173 m
  4. 200 m
Two ships are sailing in the sea on the two sides of a lighthouse. The angle of elevation of the top of the lighthouse is observed from the ships are 30° and 45° respectively. If the lighthouse is 100 m high, the distance between the two ships is:
  1. 173 m
  2. 200 m
  3. 273 m
  4. 300 m
An observer 1.6 m tall is 203 away from a tower. The angle of elevation from his eye to the top of the tower is 30º. The height of the tower is:
  1. 21.6 m
  2. 23.2 m
  3. 24.72 m
  4. None of these
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