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The angle of elevation of a ladder leaning against a wall is  60°and the foot of the ladder is 4.6 m away from the wall. The length of the ladder is

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a
2.3 m
b
4.6 m
c
7.8 m
d
9.2 m

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detailed solution

Correct option is D

Let AB be the wall and BC be the ladder.

Then  ACB=60° and  AC=4.6m

cos60°=ACBC

12=ACBC

BC=2AC

=(2×4.6)m

BC=9.2m

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