It's about 4305 square feet.
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Length times width will give you area. So this comes out to 400 square feet.
It is: 20 times 20 = 400 square feet
6,400 square feet (400 x 16 = 6,400).
400 (20x20) square inches is 2.78 square feet.
If that is 20ft by 20ft then there are 400 square feet