For any nonagon in general:
Perimeter = (side-1 + side-2 + side-3 + . . . . . + side-8 + side-9)
For a regular nonagon:
Perimeter = 9 x (length of one side)
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It is the sum of the lengths of the nine sides of the nonagon.
A regular nonagon has 9 sides and so its perimeter is 9*40 = 36 units of measurement
It is: 162/9 = 18cm
9 * 10.2 = 91.8 centimetres.
I think you mean a regular nonagon. This is a nine-sided polygon. If you have the length of one side, you can multiply it by 9 to find the perimeter of all sides.