Which shapes are not polygons?

See below: Polygons are shapes with 3 or more straight sides, are closed, and do not have overlapping sides. Most shapes are polygons like: triangles, squares, rectangles, pentagons, hexagons, octagons, etc. There are only a couple named shapes that are not polygons like: These shapes are all not polygons because they have curved sides.

What does it mean to be a polygon?

This raised the important point: being a polygon means you have to have all 5 criteria: 1. 2D shape 2. Closed - no gaps 3. Straight sides 4. 3 or more sides 5. No crossing over If you fail one of these things, you are not a polygon.

What is the difference between a polygon and a non-polygon?

A polygon is a closed geometric object that is formed by connecting a finite number of straight line segments. Each endpoint of each segment must intersect exactly one endpoint of another segment. Non-polygons shapes are shapes that do not satisfy the criteria of a polygon. Some examples of non-polygons are the following: