A flagstaff stands on top of a building 25 m high. From a point on the ground, the angle of elevation of the top of the building is 45° and that of the top of the flagstaff is 60°. Taking √3 = 1.732, what is the length of the flagstaff?
Correct answer B. 18.30 m
Explanation
Distance = 25/tan 45° = 25 m. Height to flagstaff top = 25 x √3 = 43.30 m. Flagstaff = 43.30 - 25 = 18.30 m.
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