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20 feet times 40 feet = 800 square feet
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Area of deck = (20+2d)x(40+2d)-(20x40) Area of deck = (20x40)+40d+80d+4d2 -(20x40) Area of deck = 120d+4d2
960 square feet.
There are 324 square feet
87.75 square inches
1750