In a circle of radius $21$ cm, an arc subtends an angle of $60°$ at the centre. Find the area of the sector formed by the arc. Also, find the length of the arc.

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Step 1: Area of sector $= \frac{60}{360} 	imes \frac{22}{7} 	imes 21 	imes 21 = 231$ cm$^2$.
Step 2: Length of arc $= \frac{60}{360} 	imes 2 	imes \frac{22}{7} 	imes 21 = 22$ cm.

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