2010 · Q42
The angle of elevation of the top of a tower from the bottom of a building is twice that from its top. What is the height of the building if the height of the tower is 75 m and the angle of elevation of the top of the tower from the bottom of the building is 60° ?
Elementary MathematicsTrigonometry
- A25 m
- B5 m
- C50 m
- D60 m
Explanation
tan60=75/d and tan30=(75-h)/d give h=50 m.