An acre was NOT defined as 43560 feet, but as 43560 SQUARE feet.
This is immediately apparent when you consider that an acre is a measure of area, with dimensions [L2]. A foot is a measure of distance, with dimensions [L]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions without additional information.
An acre is equivalent to the area of 1 furlong (660 feet) by 1 chain (66 feet).
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1 acre = 43560 square feet = 4047 square meters1 acre = 43560 sq feet.
43560 feet is one acre.
There are 43560 square feet in one acre
1 acre = 43560 sq ft so 18 acres = 43560*18 = 784,080 sq feet. Simple!1 acre = 43560 sq ft so 18 acres = 43560*18 = 784,080 sq feet. Simple!1 acre = 43560 sq ft so 18 acres = 43560*18 = 784,080 sq feet. Simple!1 acre = 43560 sq ft so 18 acres = 43560*18 = 784,080 sq feet. Simple!
1 acre = 43560 sq feet.