Not surprisingly, it is called a side!
A five-sided polygon is called a "pentagon."
A 30-sided polygon is called a triacontagon. The prefix "tria-" is derived from the Greek word for three, and "contagon" is derived from the Greek word for angle. Therefore, a triacontagon has 30 sides and 30 angles.
An 18 sided polygon is called a Octadecagon or a Octakaidecagon
A 6 sided polygon is called an hexagon
A polygon with 12345 sides is called a myriagon. The term "myriagon" is derived from the Greek words "myria" meaning 10,000 and "gon" meaning angle. It is a type of regular polygon with all sides and angles equal in measure. The interior angles of a myriagon can be calculated using the formula (n-2) * 180 degrees, where n is the number of sides.
A fourteen-sided polygon is called a tetradecagon.
It is called a heptagon.
The 11 side polygon is called bysocleptron
For a nine side polygon its called a nonagon.For a nine side polygon its called a nonagon.For a nine side polygon its called a nonagon.
10 side polygon is called decogon
The name of a 10 side polygon is called a decagon