Question

SOLVE THIS TO KNOW YOUR KNOWLEDGE​

Answer 1

see mate

the cow is tied with a rope 6m long so the maximum are it can graze is equal to that of a circle of radius 6m

so the maximum area can be achieved in a figure with max sides so hexagon

but changing the perspective as the question does not mention about the dimension of any figure so it is possible to introduce a vircle of rad 6 in any of the above given 3 geometrical figures

as due to lack of complete information all 3 figures must be considered correct

hope it helps u....