3.1 square miles is exactly 1,984 acres.
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1 sq mi = 640 ac => 30 000 ac = 30 000 / 640 = 46.875 sq mi
One billion acres is equal to approximately 1,562,500 square miles.
An acre is 4,840 square yards.A square yard is 3 feet x 3 feet, which is 9 square feet.4,840 square yards ( 1 acre) is 4,840 x 9 square feet, which is 43,560 square feet.18 acres is therefore 18 x 43,560 square feet, which is 784,080 square feet.
1200000 sq ft is equal to approximately 27.47 acres.
1.5 sq miles = 1.5*1760*1760 sq yards = 4 646 400 sq yards 1 acre = 4 840 sq yd so 1.5 sq miles = 4 646 400 / 4 840 = 960 acres.