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If the area of a square is 81, then the length of a side is 9. Add up the length of all four sides to get the perimeter: 9 + 9 + 9 + 9
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if one length is 9cm, the other length must be 6cm to make an area of 54cm. hence the perimeter is 9+9+6+6 = 30cm
The perimeter of a square is 4 times its sides. So a square garden with a length of 9 feet has a perimeter of 4*9 = 36 feet.
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