40 x 40 = 1600 square feet (can also be written as 1600ft2).
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40x40=1,600 sq. ft. 100 sq. ft. in a square. 16 square. Allow extra for the starter row and the cap unless you are going to use a ridge vent.
If you mean a 9 ft x 10 ft floor, then it is 90 ft2.
20 ft x 20 ft = 400 sq ft.
6 sq. yds
800 on each floor.