# Polygons

## Classification, Angles

Polygons are closed **plane** figures bounded by three or more line segments. In the world of **geometry**, polygons abound. The **term** refers to a multisided geometric form in the plane. The number of angles in a polygon always equals the number of sides.

Polygons are named to indicate the number of their sides or number of noncollinear points present in the polygon.

A **square** is a special type of polygon, as are triangles, parallelograms, and octagons. The prefix of the term, *poly* comes from the Greek word for many, and the root word *Gon* comes from the Greek word for **angle**.

## Additional topics

Science EncyclopediaScience & Philosophy: *Planck mass* to *Posit*