400 square feet. This is an easy calculation - just multiply the length in feet by the width in feet. The answer is the number of square feet.
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2.77 square feet.
2.78 square feet.
20 square feet (5x4=20)
20' x 30' = 600 square feet.
If you mean square feet, there are 100 square feet in a square. So 20 squares is 2000 square feet.