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Railways PYQCBT 1 2016

RRB NTPC · Question 18

The angle of elevation of a ladder leaning against a house is 60° and the foot of the ladder is 6.5 metres from the house. The length of the ladder is

  1. 15 metres

  2. 13 metres

  3. 11.25 m

  4. 10.5 m

Show answer & explanation

Answer: (B) 13 metres

Explanation

The ladder, the wall and the ground form a right triangle. The angle at the ground is 60° and the foot is 6.5 m from the wall, so cos 60° = 6.5/length. Length = 6.5/0.5 = 13 metres.