You add together the lengths of the nine sides of the nonagon.
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The answer depends on what information you have. If you have the length of a side, then the perimeter is nine times that length.
90
The area is 1583 square units, approx.
Each side is 117/9 = 13 cm
If it is a regular nonagon then it has 9 equal sides, so all you needed to do was divide 31.23 by 9. (You would have got 3.47 cm)