8 * 9 = 72
Seventy two square feet
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8' x 9' = 72 square feet.
There are 9 square feet to a square yard, so 800 square feet = 800/9 square yards = 88 8/9 square yards.
It is: 8*8.75 = 70 square feet
9 x 9 = 81 square feet.
There are: 8/12 times 10/12 = 5/9 square feet