Nonagon
For given polygons, the names are from their Latin roots.
3 ; Trigon(triangle)
4 ; Tetragon ( any quadrilateral).
5 ; Pentagon
6 ; Hexagon
7 ; Heptagon
8 ; Octagon
9 ; Nonagon
10 ; Decagon.
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The name of a 12 sided polygon is Dodecagon.
A 8 sided polygon is called a octagon.