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A circular area of 5 miles radius covers 50265.5 acres (to 1 dp) Area = pi*radius2, which with radius in miles will give you area as 78.53982 square miles, then multiply by 64 â¦ 0, since there are 640 acres in 1 square mile.
One acre is 43,560 square feet so 100 acres is 4,356,000 square feet. Your pasture is square so if the length of a side is L feet then L2 = 4,356,000. Thus L = â4,356,000 = 2,087 feet and hence the distance around the pasture is 4 Ã 2.087 = 8, 348 feet or about 1.6 miles.