If the diameter of circular pond is 84 m ,find the cost of fencing around it with four rounds 8 rs 12 per metre?

First, we need to calculate the circumference of the circular pond:

Circumference = π x diameter
Circumference = π x 84
Circumference = 264 m

Now, we need to calculate the total length of fencing required for four rounds around the pond:

Total length of fencing = 4 x Circumference
Total length of fencing = 4 x 264
Total length of fencing = 1056 m

Now, we can calculate the cost of fencing:

Cost of fencing = Total length of fencing x Cost per metre
Cost of fencing = 1056 x 12
Cost of fencing = 12672 rs

Therefore, the cost of fencing around the circular pond with four rounds at 8 rs 12 per metre would be 12672 rs.

Circumference of the pond = πd = (22/7) x 84 = 264 m

Cost of fencing 4 rounds = 4 x 264 x 12 = Rs. 12960