It has 9 vertices
Nine
A nonagon has nine sides, nine angles and nine corners (vertices).
45
A polygon with 9 vertices and 9 sides is a nonagon.
nonagon
There are 9 vertices in a nonagon.
9
Nine
Ten.
If you mean a nonagon then it has 9 vertices and 9 sides
10 vertices because nine at the bottom and one at the top
A nonagon has nine sides, nine angles and nine corners (vertices).
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nonagon
A polygon with 9 vertices is a nonagon.
It has nine corners (vertices). Whether it is irregular or not is an irrelevance.
A nonagon is a polygon with n vertices (or 9 sides).