The amount of fence needed to surround 2 acres depends on the perimeter, not the area.
That depends on the shape of the lot. But, if the lot was a perfect square, you would need 2,891.98 feet of fence to surround it.
That would depend on the length and width of the acreage.
That depends on the shape of the lot. But, assuming the lot is a perfect square, you would need 10,560 feet (two miles) of fence to surround it.
An acre is 66 feet by 660 feet so 1,452 feet of fence would surround an acre.
That all depends on the shape of the lot. But, if the lot was a perfect square, you would need 5,280 feet (one mile) of fence to surround 40 acres.
60 acres is 9013 ft. in square pasture
1 acre = 43,560 square feet. 5 acres = 217,800 square feet. That's a square 466.69 feet on a side. If you need to fence all 4 sides, then you need 1,866.76 feet of fencing.
You would need 2,640 feet of fence.
9013 ft. square pasture
Any measure greater than or equal to 1181 feet - up to infinitely many feet.
There are 43, 560 square feet in an acre. There are 348,480 square feet in eight acres. Assuming that the area is a square, you will approximately need 2361.28 feet of fencing. If the area is one foot wide, you will need a lot more fence than that.