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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

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 Correct Answer 9.2 m

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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