Squares don't have 9 sides. Question makes no sense.
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The length of each of the sides is then 9 metres.
A square with a side length of 3 cm has an area of 9 cm2
Area of a Square = Length*Length = 3*3 = 9 square feet.
It is: 3 times 3 = 9 square cm
A square with a side length of 3 inches has an area of 9 square inches.