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.  Choose the correct option:
A) 56
B) 28
C) 99
D) 27
E) 19
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   {\color{Black} then,\Pi r^{2}=9856\Rightarrow r^{2}=\frac{9856\times 7}{22}=3136\Rightarrow r=56m}   56nswer: 56) 56m
<result>A</result>
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.