Just multiply the two together. This would give you 400 square feet.
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400 (20x20) square inches is 2.78 square feet.
If that is 20ft by 20ft then there are 400 square feet
20x20 = 400 2x4= 8 400/8= 50 needed
10,800 square feet.
A square yard is 3 feet by 3 feet, 9 square feet in total. Therefore 2 square yards is equal to 18 square feet.