enneadecagon or enneakaidecagon
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.
An eighteen-sided shape is called an octakaidecagon, or octadecagon.
The name for a 57 sided shape is derived by combining the name for a 50 sided shape with the name for a 7 sided shape. A 57 sided shape is called a pentacontaheptagon.
A 999 sided shape is simply known as a 999 sided shape.
A nonagon is a nine sided shape.
All I can tell you is that a 16 sided shape is called a Hexadecagon
Shapes with 12 to 20 sides are named as follows: a 12-sided shape is called a dodecagon, a 13-sided shape is a triskaidecagon, a 14-sided shape is a tetradecagon, a 15-sided shape is a pentadecagon, a 16-sided shape is a hexadecagon, a 17-sided shape is a heptadecagon, an 18-sided shape is an octadecagon, a 19-sided shape is a nonadecagon, and a 20-sided shape is an icosagon.
If you say this shape is 18 sided i would guess it has 18 sides. ;)
Tetrahaidecahedron
octadecagon
no
An 18 sided shape is called a octadecagon. This refers to both 2 dimensional and 3 dimensional shapes in a mathematical sense.
Octadecadron
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.
The interior angles of an 18 sided polygon add up to 2880 degrees
If it is a 2 dimentional shape it is called an 'octadecagon'
An eighteen-sided shape is called an octakaidecagon, or octadecagon.