The angle of elevation of the top of an unfinished pillar at a point 150 metres from its base is 30°. The height (in metres) that the pillar must be raised so that its angle of elevation at the same point may be 45°, is (takeing √3 = 1.732)
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1
BC = 150 tan 30 = 50√3 = 86.6
AC = 150 tan45 = 150
AB = AC - BC = 150 - 86.6 = 63.4 m