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.
Nine
Ten.
A nonagon has nine sides, nine angles and nine corners (vertices).
45
A polygon with 9 vertices is a nonagon.
A nonagon is a polygon with n vertices (or 9 sides).
It has nine corners (vertices). Whether it is irregular or not is an irrelevance.
A polygon with 9 vertices and 9 sides is a nonagon.
nonagon
A nonagon has 9 vertices
A nonagon has 9 vertices. It has internal angles of 140 degrees, and it is a regular polygon. The temples of Baha'i Faith are required to be nonagonal.