Step-by-step explanation:
Given diameter of a circular pond: 84 m.
Therefore Radius = D/2 = 84/2 = 42 m.
Circumference of the pond: (Assuming π = 22/7)
- 2*π*r
- 2*22/7*42 = 22*2*6 = 264 m
Given for fence it costs for 1 metre --> Rs. 12
For 264 meters,or for 1 round,it would cost the fence: 264*12 = Rs. 3168
We have to find the cost of fencing around for 4 rounds
- Note that 1 round = Circumference of the pond = 264 => For four rounds of fencing = 4*264 m = 1056 m
Thus for four rounds, it costs 4*3168 = Rs. 12672
