A nongon does not mean anything - in maths or otherwise. A nonagon, on the other hand, is a plane (2-dimensional) figure bounded by nine straight sides. It has 9 vertices.
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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.
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math 7
Math that is in none of the catagories of math