A irregular nonagon is a polygon that is not a regular polygon.
The name for this polygon is a nonagon,
A nonagon is a polygon with 9 sides
a nine sided polygon is called a nonagon.
nonagon
A nonagon
Nonagon.
A nonagon.
Only if all nine sides are the same length.
A nonagon is a polygon with n vertices (or 9 sides).
polygon or nonagon
A nonagon is a nine-sided polygon.