A nine sided plane figure is a nonagon. A nine sided three dimensional figure is a nonahedron.
A 9 sided polygon is a nonagon
A 9 sided polygon is a nonagon
this is called a nonagon
it is called a nonagon
A nonagon has 9 sides
A 7 sided pyramid would be called a heptahedral or heptahedron.
a nonagon
A nonagon
A nonagon
nonagon
nonahedron
A nonagon