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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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- 2.3 m
- 4.6 m
- 7.8 m
- 9.2 m
Correct Option: D
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 x AC
= (2 x 4.6) m
= 9.2 m.
