Answer: 17,784 ft² = 0.408264 acres (about 41% of an acre).
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43,560 square feet per acre.
1 acre is 4840 sq yards. Now 1 sq yard = 9 sq feet (3 feet x 3 feet), so 1 acre = 43560 sq feet. your area is 170 x 70 sq feet = 11900 sq feet. So this is 11900/43560 of an acre, answer = 0.273 acre.
435.6 square feet
An acre is 43,560 sq ft so .012837 or 1.28 %
An acre contains 43,560 square feet. The conversion says that it would be 7200 square feet.