2009 · Q12
The angle of elevation of the top of an unfinished pillar at a point 150 m from its base is 30°. If the angle of elevation at the same point to be 45°, then the pillar has to be raised to a height of how many metres?
Elementary MathematicsTrigonometry
- A59.4 m
- B61.4 m
- C62.4 m
- D63.4 m
Explanation
Height to raise = 150 − 150/√3 ≈ 63.4 m.