JEE Main2003MathematicsHeights and DistancesActual
The upper 3 4 th portion of a vertical pole subtends an angle ⁻¹ 3 5 at a point in the horizontal plane through its foot and at a distance 40 ~m from the foot.
Options
- A80 ~m
- B20 ~m
- C40 ~m
- D80 ~m
Correct answer
A. 80 ~m
Step-by-step solution
= - 1+ or 3 5 = h 40 - h 160 1+ h 40 h 160 h ^2-200 ~h +6400=0, ~h =40 or 160 metre Therefore possible height =40 metre