Question

find the length of a rope by which a cow must be tethered in order that it may be able to grade and area of 9856 m square

Answer 1

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, πr2=9856 ⇒ r2=9856×722=3136 ⇒r =56m

Answer 2

Answer:

let length be r . Then,

area = 9856

$\pi {r}^{2} = 9856$

=22/7*r2 =9856

= r2= 9856*7/22

= r2= 3136

=r =√3136

=r = 56