9 sq
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A square with a side length of 9 units has an area of 81 square units.
2x9 =18 square units
117 units squared.
Given that 81 sq. units is the area. Then square root (81 units^(2) = 9 units. S9 units is the length of one sude. Since there are 4 sides. to the perimter Then 4 x 9 units = 36 units. NB I have used the word 'units' ., because you have not specified the actual units 'inches, feet, etx., or cm , m. etcs.,
Unless there is a given measurement of the lengths of the sides of the figure (ex. cm., mm., in.) you would say units, and put a little 2 as an exponent because you need to write square units.