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: Option A
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 \(\mathrm{πr}^2=9856\;\Rightarrow\;\mathrm r^2=\frac{9856\times7}{22}=3136\;\Rightarrow\mathrm r\;=56\mathrm m\)
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