1 sq kilometre = 247.1 acres, approx.
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(1 kilometer)2 x (1,000 meters per kilometer)2 x (3.28084 feet per meter)2 / (43,560 square feet per acre) =247.1054 acres (rounded)
3 acres = 130,680 sq feet
10117.14 sq m = 2.5 acres
65 acres = 2831400 sq ft
2800 sq metres = 0.6919 acres