An inch is a unit of length. A square foot is a unit of area. The two units are therefore incompatible.
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1 foot = 12 inches 1 sq foot = 144 sq inch 3612 sq inches = 3612/144 sq feet
There are 144 sq. inches in a sq. foot, so 144 x 20 = 2880 sq. inches
144 in^2
There are 144 sq inches in 1 sq ft, SO ... 576/144 = 40 sq ft
1 sq foot = 144 sq inches Answer = 2 sq feet = 288 sq inches