1 square mile = 640 acres
4 acres = 4/640 = 1/160 square mile = 0.00625 square mile = (5/8 of 1%) of a sq mi
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There are 320 acres in a half mile by a half mile area.
1 acre = 43,560 square feet. 1 square mile = 5280x5280 = 27,878,400 square feet. Thus there are 640 acres per square mile. So 4 acres = 0.00625 square miles.
Answer: 1,000,000 acres = 1562.5 square milesIf the million areas was shaped like a square, each side of the square would be about 39.53 miles. (Square root of 1562.5)The distance around the square would be about 158.12 miles. (39.53 miles times 4)Note: There is error introduced by rounding.
4 miles by 2.5 miles is 10 Square Miles = 6400 Acres
There is no whole unit that will answer your question. One Square Mile = 640 acres One Square Mile = 260 Hectares (not 160). There is no unit which equals 4 acres (which would be the answer you are looking for). A scotts acre (or scottish acre) is equal to 1.3 common acres - but again that doesn't add up to what you are looking for.