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


In ,

As  is isosceles,

Hence, the height of flag staff = AB + BC = 9 + 4.5 =13.5 m

  • 29

sin 60=9+x/9

 rot 3/2=9+x/9

9root 3=18+2x

2x=18-9root 3


  • -7
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