Assume the dimension is 100 ft by 400 ft.
By the area formula:
A = 100 ft * 400 ft = 40,000 ft²
Note that 1 ft² ≈ 2.296 x 10-5 acres. Then, 40,000 ft² ≈ 0.9183 acres
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43,560 square feet = 1 acre
100' x 400' = 40,000 square feet = 0.9183 acre(rounded)
100 ft * 400 feet = 40000 square feet = 40000/43560 = 0.92 acres, approx.
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.
300 by 400 feet is two and three-quarters acres
One acre has 43,560 square feet. Divide the number of square feet, 200,000, by that and you get the number of acres. This gives you an answer of 4.59 acres.