400,000 acres is 625 square miles.
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400 acres is 17,424,000 square feet.
One acre has 43,560 square feet. Divide the number of square feet by that and you get the number of acres. This gives you an answer of 3.67 acres.
400 ft * 900 ft = 8.26 acres, approx.
400 by 400 feet = 160,000 square feet 160,000 square feet = 3.6730946 acres
300 by 400 feet is two and three-quarters acres