1 acre = 0.004047 square km, approx
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Answer: 1 acre = 0.004046 km²
approx 0.805 km of fencing. 10 acre = 48400 sq yds ⇒ each side of square = √48400 yds = 220 yds ⇒ perimeter = 4 x 220 yds = 880 yds 1 km ≈ 1094 yds ⇒ perimeter ≈ 880 ÷ 1094 km ≈ 0.805 km
The question really doesn't make sense because an acre is a measurement of area and a kilometer is a measurement of length/distance.Well i think he meant Km2 (square), not the length. One acre is equal to 4080m2 and One Km square is 1000m2, the rest is easy.
1 acre = 4,046.8564 square meters
1 acre is 160 square poles.