Chapter 6
Measuring Space: Perimeter and Area
CBSE Class 9
Mathematics Solutions
Educart Mathematics class Class 9 NCERT Exemplar cover
Question:

A hexagon is inscribed in a circle of radius rr. Show that the ratio of the area of the hexagon to the area of the circle is equal to 332π0.827\frac{3\sqrt{3}}{2\pi} \approx 0.827. Can you see why the answer is exactly twice the answer to Question 28?                                                                                                                                                                                                                                           [Page No. 148]

Answer: Verified

For regular hexagon inscribed in circle of radius rr:

Side of hexagon = rr

Area of regular hexagon=332×r2\text{Area of regular hexagon} = \frac{3\sqrt{3}}{2} \times r^2

Area of circle=πr2\text{Area of circle} = \pi r^2

Ratio=33r22πr2=332π0.827.\text{Ratio} = \frac{\frac{3\sqrt{3}r^{2}}{2}}{\pi r^{2}} = \frac{3\sqrt{3}}{2\pi} \approx 0.827.

Hence, proved.

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