A nine-sided object is known as a nonagon.
Octagon.
A five sided 2 dimensional object is called a pentagon.
nonagon
A triangular pyramid.
A object with 7 sides is known as a heptagon.
The name of a 9 sided polygon is Nonagon.
The name of a 9 sided polygon is nonagon or enneagon.
Decagon.
octagon
hendecagon
Octagon.
The name of a 9 sided polygon is nonagon.
the Greeks used prefexes up to ten, modernly we have sdded dodecagon for a twelvesided object and undecagon for an eleven sided object so the propor name would be a 27 sided object.
Decagon
A hexakaidecagon (hexadecagon).
A five sided 2 dimensional object is called a pentagon.
Nonagon is the name of a 9 sided shape. The US Steel Tower in Pittsburgh, Pennsylvania is a nonagon.