For a 2-dimensinal shape ;-
3; trigon (triangle)
4; tetragon ( quadrilatertal)
5; pentagon
6; hexagon
7; heptagon
8 ; Octagon
9 ; nonagon ( The answer to your question).
10 ;decagon.
For a 3-dimensional object.
4; tetrahedron
5 ; pentahedron
6 ; hexahedron
7 ; heptahedron
8 ; octahedron
9 ; nonahedron
10; deahedron.
The nomenclature is bases on Latin.
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A 2d nine sided shape is called a nonagon.
A nine sided POLYGON is called a nonagon. Any plain shape bounded by nine straight sides is a nonagon.
A nine sided shape is called a nonagon.
Nonagon (nona- means nine).
Nine-sided closed figure