If it is a 2 dimentional shape it is called an 'octadecagon'
All I can tell you is that a 16 sided shape is called a Hexadecagon
Octadecadron
The 22 sided shape is called a: ICOSIKAIDIGON
Hommasquabblelagagon
A five-sided shape is called a pentagon.
All I can tell you is that a 16 sided shape is called a Hexadecagon
Octadecadron
Octagon
An 18 sided shape is called a octadecagon. This refers to both 2 dimensional and 3 dimensional shapes in a mathematical sense.
An eighteen-sided shape is called an octakaidecagon, or octadecagon.
A polygon refers to a plane figure that has at least three straight sides and angles. An 18 sided shape is called an octadecagon or octakaidecagon.
it is called a seven sided shape in Canada
The 22 sided shape is called a: ICOSIKAIDIGON
A 90 sided shape is called Enneacontagon.
Hommasquabblelagagon
A five-sided shape is called a pentagon.
A seven sided shape is called a heptagon.