Which shape is categorized as a polygon with 8 sides?

A shape with 8 sides is termed an octagon. The term "octagon" is derived from the Greek words "okto," meaning eight, and "gonia," meaning angle. In geometry, polygons are classified based on the number of their sides, and the octagon specifically represents a closed figure with eight line segments.

To further clarify why the other options do not fit: a heptagon has 7 sides, which makes it distinct from the octagon. A hexagon, on the other hand, has 6 sides, which is another separate classification. Lastly, a nonagon refers to a polygon with 9 sides. Each of these shapes has unique properties and qualifications, but only the octagon directly corresponds to a figure with 8 sides.