Any number between 2 and 9.
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It is the sum of the lengths of the nine sides of the nonagon.
First of all its not NANOGON its NONAGON......... A nonagon has 9 sides..
A nonagon has 9 sides and a decagon has 10 sides
A nine sided nonagon is only a regular shape if it has 9 equal sides
hexagon = 6 sides heptagon = 7 sides octagon = 8 sides nonagon = 9 sides