A ladder 18 m long rests against a vertical wall and makes an angle of 60° with the level ground. Taking √3 = 1.732, how high up the wall does the top of the ladder reach?
Correct answer C. 15.59 m
Explanation
sin 60° = height / ladder, so height = 18 x √3/2 = 9√3 = 9 x 1.732 = 15.59 m.
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