A three-sided, two-dimensional polygon is called a "triangle".
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 seven sided figure is called a heptagon.
A six-sided plane figure is called a hexagon.
A six-sided plane figure is called a hexagon.
It is called a nonagon. There currently is no official name for a nine-sided polygon. However, two names have been proposed for such a figure: the first is a Nonagon; the second is an Enneagon.
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.