A nonagon has nine sides, nine angles and nine corners (vertices).
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it depends on what you mean by a diagonal. If you take a diagonal to mean a line from one corner to the "opposite" corner, then a nonagon doesn't have any, and a decagon has five. The reason a nonagon doesn't have any, is that the corners aren't opposite each other.
A Nonagon has 9 sides
a nonagon have 9 sides...
what is the total of interior angles in a nonagon?
A nonagon has 9 rotation symmetry