From a window 15 m above the ground, the angle of elevation of the top of a building across the street is 30° and the angle of depression of its foot is 45°. Taking √3 = 1.732, what is the height of the building?
Correct answer B. 23.66 m
Explanation
Street width = 15/tan 45° = 15 m. Height above the window = 15 tan 30° = 8.66 m. Building = 15 + 8.66 = 23.66 m.
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