Closed shapes or figures in a plane with three or more sides are called polygons. Alternatively, a polygon can be defined as a closed planar figure that is the union of a finite number of line segments. In this definition, you consider closed as an undefined term. The term polygon is derived from a Greek word meaning “many‐angled.”
Polygons first fit into two general categories— convex and not convex (sometimes called concave). Figure 1 shows some convex polygons, some non‐convex polygons, and some figures that are not even classified as polygons.
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Answer:
Closed shapes or figures in a plane with three or more sides are called polygons. Alternatively, a polygon can be defined as a closed planar figure that is the union of a finite number of line segments. In this definition, you consider closed as an undefined term. The term polygon is derived from a Greek word meaning “many‐angled.”
Polygons first fit into two general categories— convex and not convex (sometimes called concave). Figure 1 shows some convex polygons, some non‐convex polygons, and some figures that are not even classified as polygons.