The angle of elevation of a ladder leaning against a wall is 60º and the foot of the ladder is 4.6 m away from the wall. The length of the ladder is:  Choose the correct choice from the following answers:
A) 2.3 m	B) 4.6 m	C) 7.8 m	D) 9.2 m	E) 10.1
Let AB be the wall and BC be the ladder.   Then, ACB = 60º and AC = 4.6 m.   AC/BC= cos 60º =1/2   BC = 2 x AC   = (2 x 4.6) m   = 9.2 m.   Answer: Option 9.2 m
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The angle of elevation of a ladder leaning against a wall is 60º and the foot of the ladder is 4.6 m away from the wall. The length of the ladder is: