ennedagon
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It is called a nonagon and/or an enneagon. They belong to the greater family of polygons.
The name of a 9 sided polygon is Nonagon.
The name of a 9 sided polygon is nonagon or enneagon.
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.
Nonagon is the name of a 9 sided shape. The US Steel Tower in Pittsburgh, Pennsylvania is a nonagon.