Q:
The angle of elevation of a ladder leaning against a wall is 60 deg and the foot of the ladder is 4.2 m away from the wall. The length of the ladder is
Answer & Explanation
Answer: A) 9.2 m
Explanation: Let AB be the wall and BC be the ladder. Then, ∠ACB=60° and AC=4.6 m. AC/BC = cos 60° = 1/2 ⇒BC = 2×AC =(2×4.6)m = 9.2 m

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