If a polygon has 8 sides, what is it called?

A polygon with 8 sides is referred to as an octagon. The term "octagon" is derived from the Greek word "okta," meaning eight. In geometry, polygons are named based on the number of their sides, and therefore, octagons specifically indicate a shape with eight edges and eight vertices.

To further clarify, a hexagon has 6 sides, a heptagon has 7 sides, and a nonagon has 9 sides. This systematic naming convention helps in identifying and categorizing polygons easily based on the number of sides they possess. Thus, in recognition of its eight sides, the polygon in question is classified as an octagon.