86,310 square feet is 9,590 square yards.
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9 ft * 10 ft90 ft2 / 9 ft2/yd210 yd2
By the area formula of what I assume is a parallelogram, the total ft2 is 13(8) = 104. Hence, we divide by 9, yielding 104/9 yd2. Alternatively, we can note that each is 3 feet, so we divide by 3, producing (13(8))/(3(3)) = 104/9 yd2.
Using 3.14 as Pi the area of circle is: 153.86
The ratio is 19/9.
Area = 139.36 ft2