A ladder of length 3.5m just reaches the top of a wall. If the ladder makes an angle of 60° with the wall, then what is the height of the wall (in m)?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 1.75
In triangle ABC, ∠B is 90º and ∠ACB = 60º
cos60° = BC/AC
⇒ BC = cos60° × AC
⇒ BC = (1/2) × AC = (1/2) × 3.5
⇒ BC = 1.75 cm