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  • In a circle of radius 21 cm, an arc subtends an angle of 60° at the centre. Find: (ii) area of the sector formed by the arc

5. In a circle of radius 21 cm, an arc subtends an angle of 60° at the centre. Find:

 (ii) area of the sector formed by the arc

Answers (1)

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We know that the area of the sector is given by:- 

                                             Area\ =\ \frac{\Theta}{360^{\circ}}\ \times \pi r^2

                                                         \\=\ \frac{60}{360^{\circ}}\ \times \pi \times 21^2\\\\=\ 231\ cm^2          

Thus the area of the sector is 231 cm2.

Posted by

Devendra Khairwa

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