The angle of elevation of a ladder leaning against a wall 60° and the foot of the ladder is 4.6 m away from the wall. The length of the ladder is?
- 9.2
- 10.2
- 8.2
- None of these
Explanation
cos 60° = adjacent side / hypotenuse
= 4.6 / length of ladder
1/2 = 4.6 / length
length = 4.6 × 2
= 9.2 m
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