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A rope by which a cow is tethered is increased from 16 m to 23 m. How much additional ground does it have now to graze?

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At radius = 16 m, cow can graze the area of plot is πr2

= 22/7 x 16 x 16

= 804.5 m2

At radius = 23 m, cow can graze the area of plot is πr2

= 22/7 x 23 x 23

= 1662.57 m2

Additional ground area = 1662.57 – 804.5 = 858 m2

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