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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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