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An acre is 43,560 square feet. Half an acre is half that amount. Choose any number of feet for the length, then divide the square feet (for half an acre) by that number to get the width.
One acre = 43,560 square feet. One half acre = 21,780 square feet. Since the area is a square, the sides are all equal in length. So one knows that to solve this requires knowing what number multiplied by itself equals 21,780. The solution is to take the square root of 21,780 which is equal to 147.58 feet or the dimensions of all four sides.
1 half acre = 21 780 square feetMore about calculator.
1/2 acre is 21,780 square feet.
Assuming that an acare refers to an acre, the answer is 21780 square feet.