If you are asking for "square" feet, the depth is irrelevent.
The area would be 85 square feet
If you want a figure which takes the depth of 4 inches into the account, the number of "cubic feet" would be roughly 28 cubic feet.
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A circle with a radius of 80 inches has an area of 139.6 square feet A circle with a circumference of 40.5 feet has an area of 130.5 square feet
A circle that is 4 feet 6 inches in diameter has an area of: 15.904 square feet.
If the radius of a circle is 80 inches, then the area of the circle is 139.6263 square feet. (rounded)
26 square feet.
One cubic yard covers 81 square feet 4 inches thick.