How many feet of fencing would I need to fence in 30 acres?

I know that there are 43560 square feet in an acre, but I just need the borders. Not sure how to figure this out.|||Assuming the area is square, take the square root of the total area. This gives the length of one of the sides. Multiply that by 4 to get the perimeter.|||1 acre is 210 feet, times that by 30 = 6300 feet, and thats just one side. Now you got to come down the other side and thats another 6300 feet, and 210 feet across each end, add it up yourself.|||you need the size of each panel. then divide in to the space?