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Discussion :: Height and Distance

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

2.  A. 2.3 m B. 4.6 m C. 7.8 m D. 9.2 m

Answer : Option D

Explanation :

Let AB be the wall and BC be the ladder.

Then, ACB = 60° and AC = 4.6 m.

 $$\frac { AC } { BC }$$= cos 60° = $$\frac { 1 } { 2 }$$

 BC = 2 x AC = (2 x 4.6) m = 9.2 m.

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