An acre is 4840 sq yds, so a 40 acre square is 40 x 4840 sq yds. As the sides of a square are all the same, the side of a square of this area is sqrt(40 x 4840) yds = 440 yds.
So it is 440yds = 1/4 mile = 2 Furlongs = 20 chains = 1320 ft = 15,840" = 40233.6cm = 402.336m ~= 0.402Km ~= 2/5Km.
You didn't state what units you wanted for the answer, so take your pick.
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If the acre is a square it would be 63.61 meters wide.
An acre, in the form of a square, is 209 ft wide, approx.
About 40% of an acre.
One square acre is 43,560 square feet. One third of that is 14,520 square feet.
208.70999998' x 208.70999998' = 1 square shaped acre