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Find the length of a rope by which a cow must be tethered in order that it may be able to graze an area of 9856 sq meters.

Correct Answer: 56m

Explanation:

clearly the cow will graze a circular field of area 9856 sq m and radius equal to the length of the rope.



Let the length of the rope be r mts 


then,  πr 2 = 9856     r 2 = 9856 × 7 22 = 3136   r   = 56 m


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