20*2*7 = 280 square feet
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No. For example, a 1 ft by 9 ft rectangle (2 sides of length 1 and 2 sides of length 9) has perimeter 20 ft and an area of 9 square feet. But a 4 ft by 6 ft rectangle also has a perimeter of 20 feet, but an area of 24 square feet. These two rectangles both have the same perimeter of 20 feet but different areas.
20 feet
20' x 6' = 120 square feet.
There are: 20*4*7 = 560 cubic feet
20 inches are 1.6666666667 feet.