DRDO Multi tasking staff Model paper 5

Let AB be the wall and AC be the ladder.

Then ∠ACB = 60° and BC = 4.6 m
⇒ BC/AC = cos60° = ½
⇒ AC = 2BC
⇒ AC = 2 × 4.6 = 9.2 m
Hence, length of ladder is 9.2 meter.