Q. A ladder 9m long reaches a point 9m below the top of a vertical flag staff. From the foot of the ladder the elevation of the top of the flagstaff is 60degrees. Find the height of the flag staff.
Given that : (ladder) BP = BC = 9 m
Also,
In ,
As is isosceles,
Hence, the height of flag staff = AB + BC = 9 + 4.5 =13.5 m