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A square has all sides the same lenght. This gives us that the area, A, equals two of the sides multiplied together: A=s*s, or A=s2
The area is given as 9 cm2.
s = (sqrt)9
s=3 cm or s = -3 cm.
Since a length of a square can never be negative, the solution is the positive root of 9 cm2, which is 3 cm.
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