A thirteen-sided polygon is called a triskaidecagon or tridecagon.
A thirteen sided polygon is called a tridecagon- or you might call it a 13-gon
A seven sided figure is called a heptagon.
An eight sided figure is called an octagon.
A 3-sided figure is called a triangle.
A four sided figure is called a quadrilateral.
A 12-sided figure is called a dodecagon.
A six-sided plane figure is called a hexagon.
A six-sided plane figure is called a hexagon.
triskaidecogon
A six sided figure is called a hexagon.
A six sided figure is called a hexagon.
Yes, an eight-sided figure is called an octagon.