There is no such thing as a 1-sided polygon.
Proof:
The sum of the measure of the interior angles of a polygon is equal to 180(n-2) where n is the number of sides in the polygon.
If n=1, then the sum of the angles is 180(1-2) which is -180.
Since no angle can have a negative measure, the figure cannot exist.
A similar proof uses the formula for calculating the number of diagonals in the polygon, and this formula also shows that a 2-sided polygon cannot exist.
The name of a 12 sided polygon is Dodecagon.
A 8 sided polygon is called a octagon.
The name of a 99 sided polygon is enneacontaenneagon.
The name of a 19 sided polygon is enneadecagon.
The name of a 15 sided polygon is Pentadecagon.
The name of a 12 sided polygon is Dodecagon.
A 8 sided polygon is called a octagon.
name of 4000 sided polygon
The name of a 18 sided polygon is Octadecagon.
The name of a 99 sided polygon is enneacontaenneagon.
The name of a 8 sided polygon is Octagon.
The name of a 19 sided polygon is enneadecagon.
The name of a 15 sided polygon is Pentadecagon.
The name of a 7 sided polygon is Heptagon.
The name of a 9 sided polygon is Nonagon.
The name of a 17 sided polygon is Heptadecagon.
The name of a 14 sided polygon is Tetradecagon.