It is equivalent to 208.7 ft or 63.6 metres.
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1 acre = 43,560 square feet
An acre is defined as 43,560 square feet; the sides of a square having that area would be the square root of that number, or about 208 feet 9 inches.
1 acre = 43,560 square feet0.18 acre = 7,840.8 square feet
Answer: 1 acre = 6,272,640 in²
The square root of 1/9 is 1/3 because the square root of 1 is 1 and the square root of 9 is 3.