A circumference, C, of 80 feet defines a circle of radius R as
C = 2 pi R
and the area of the circle is A = pi R^2
A = C^2/4pi = 509.55 sq ft
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12 time 12 inches = 1 square foot (as there are 12 inches in a foot) 10 times 8 feet = 80 square feet 80 square feet divided by 1 square foot = 80 pavers.
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
That's a total of 2560 square feet.
8' x 10' = 80 square feet
Area of a circle in square feet = pi*radius2