9x9 = 81.
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9x9=81
8100
Assuming 9x9 is also in feet, then answer is 81 square feet.
6,561 (i solved it by using this sentence: (9x9) x (9x9)= 81x81=6,561
To turn a 9x9 square into an octagon you can cut corners off the square. It will not be a regular octagon though.