NTA Abhyas 2020
- Exam
- NTA Abhyas
- Year
- 2020
- Subject
- Mathematics
- Chapter
- Heights and Distances
NTA Abhyas 2020 · Mathematics · Heights and Distances
A pole is situated at the centre of a regular hexagonal park. The...
A pole is situated at the centre of a regular hexagonal park. The angle of elevation of the top of the vertical pole when observed from each vertex of the hexagon is If the area of the circle circumscribing the hexagon is , then the height of the tower is

Options
- A
- B
- C
- D
Correct answer
D.
Step-by-step solution
Let be the side of the regular hexagon
Now, for the equilateral triangle we have
Hence, area of circle,~ meters ... \left(1\right)AOT,O,\tan \left(\dfrac{\pi}{3}\right) = \dfrac{OT}{OA} ⇒ OT = OAtan\dfrac{\pi}{3} ⇒ OT = 3\sqrt{\dfrac{3}{\pi}} \times \sqrt{3}∴ OT = \dfrac{9}{\sqrt{\pi}}∴= \dfrac{9}{\sqrt{\pi}}$ meters.
Now, for the equilateral triangle we have
Hence, area of circle,~ meters ... \left(1\right)AOT,O,\tan \left(\dfrac{\pi}{3}\right) = \dfrac{OT}{OA} ⇒ OT = OAtan\dfrac{\pi}{3} ⇒ OT = 3\sqrt{\dfrac{3}{\pi}} \times \sqrt{3}∴ OT = \dfrac{9}{\sqrt{\pi}}∴= \dfrac{9}{\sqrt{\pi}}$ meters.