The question isn't worded right because you don't have "40x40 square feet."
If you are asking how many square feet are in 40 feet x 40 feet, that would be 1600 square feet.
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11.1 square feet.
"Square feet" aren't things that are used to cover area."35 square feet" is an amount of area that you have to cover with something.
about 10.5 square feet
40 x 40 = 1600 square feet (can also be written as 1600ft2).
32.3 square feet.