From the top of a building 60 m high the angles of depression of the top and the bottom of a tower are
observed to be 30° and 60°. Find the height of the tower.
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Let BC be the building and AD be the tower.
Let the height of tower, AD be h m.
Angles of depression of the top D and the bottom A of the tower CB are 30° and 60° respectively.
∴ ∠CDE = 30°
∠CAB = 60°
Since, BC = 60 m.
∴ CE = (60 – h) m
Let AB = DE = x m
In ∆DEC,
In ∆CBA,
Equating equation (1) and (2),
⇒ 3 (60 – h) = 60
⇒ 180 – 3h) = 60
⇒ 180 – 60 = 3n
⇒ 120 = 3h
⇒ h = 40
Thus, the height of the tower is 40 m.
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