convert both dimensions to feet
1 mile = 5280 feet so 1/2 mile = 5280/2 = 2640 ft
1 yard = 3 ft so 600 yards = 600*3 = 1800 feet
now calculate area = 2640*1800 = 4752000 square feet
acres = square feet / 43560 so 475200/43560 = 109.09 acres
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