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A pole is situated at the centre of a re...

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 `(pi)/(3)`. If the area of the circle circumscribing the hexagon is `27m^(2)`, then the height of the tower is

A

`3sqrt((3)/(pi))m`

B

`(3)/(sqrt(pi))m`

C

`sqrt((3)/(pi))m`

D

`(9)/(sqrt(pi))m`

Text Solution

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The correct Answer is:
To find the height of the pole situated at the center of a regular hexagonal park, we can follow these steps: ### Step 1: Understand the Geometry We have a regular hexagon with a pole at its center. The angle of elevation from each vertex of the hexagon to the top of the pole is \( \frac{\pi}{3} \) (which is equivalent to 60 degrees). ### Step 2: Area of the Circumcircle We know the area of the circle circumscribing the hexagon is given as \( 27 \, m^2 \). The formula for the area of a circle is: \[ \text{Area} = \pi r^2 \] where \( r \) is the radius of the circle. Setting this equal to \( 27 \): \[ \pi r^2 = 27 \] From this, we can solve for \( r^2 \): \[ r^2 = \frac{27}{\pi} \] Taking the square root gives us the radius \( r \): \[ r = \sqrt{\frac{27}{\pi}} = \frac{3\sqrt{3}}{\sqrt{\pi}} \] ### Step 3: Set Up the Triangle Let \( O \) be the center of the hexagon and \( T \) be the top of the pole. The distance from the center \( O \) to any vertex \( A \) of the hexagon is \( OA = r \). The height of the pole is denoted as \( h = OT \). ### Step 4: Use Trigonometry In triangle \( OAT \), we have: \[ \tan\left(\frac{\pi}{3}\right) = \frac{OT}{OA} \] Substituting the known values: \[ \tan\left(\frac{\pi}{3}\right) = \sqrt{3} \] Thus, we have: \[ \sqrt{3} = \frac{h}{r} \] Rearranging gives: \[ h = r \cdot \sqrt{3} \] ### Step 5: Substitute for \( r \) Substituting the value of \( r \): \[ h = \left(\frac{3\sqrt{3}}{\sqrt{\pi}}\right) \cdot \sqrt{3} \] This simplifies to: \[ h = \frac{3 \cdot 3}{\sqrt{\pi}} = \frac{9}{\sqrt{\pi}} \] ### Conclusion The height of the pole is: \[ \boxed{\frac{9}{\sqrt{\pi}}} \]
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