1/2 acre is 21,780 square feet.
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If the half-acre is perfectly square, 147.58 feet by 147.58 feet, then the perimeter is 590.32 feet. If it's any other shape, you would need to re-calculate the perimeter.
An acre is 43560 square feet, so 30 acres would be 1,306,800 square feet. The square root of 1,306,800 square feet is 1,143.153533 feet. So a square plot of land of 30 acres would measure 1,143 feet, 2 inches on each side. By the way, it would be very unusual to find a 30-acre square plot of land. Land is usually divided into 10-acre squares measuring 660 feet on a side. So a 30-acre plot of land would likely be a rectangle measuring 660x1980 feet.
An acre contains 43,560 square feet. The conversion says that it would be 11,325.6 square feet.
Answer: 1 acre = 43,560 ft²
Answer: 0.15 acre = 6,534 ft²