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VenusRetrograde
The formula for the area of a square is:

A=s²

Since we known that the area is 81ft², we can solve for the length of a side.

A=s²
81=s²
find the square root of both sides
9ft=s

The length of each side is 9ft
nochillalisa
All you need to do is find the square root of 81, because the formula for the area of square is [tex] s^{2} [/tex].

The square root of 81 is 9 ( 9 x 9 = 81)
To double check, plug 9 into the formula.
area = [tex]s^{2} [/tex]
area = [tex] 9^{2} [/tex]
area = 81

So, therefore, each side is 9ft.