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36 - here's how you get this answer:

81/9=9

The area is found by multiplying two sides, so take the square of 81 to get the two equal side measures. In this problem, the number is 9.

A square has four equal sides. Two of the sides are 9. Since all sides are congruent, the other two sides must be 9, too. To get the perimeter of a square, you add up all four sides. 9+9+9+9=36 or you could do 9x4 to get 36 also. Good Luck! :)

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13y ago

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