How would you define a polygon?

A polygon is defined as a closed figure formed by a finite number of line segments, which are also known as edges. These line segments connect at points called vertices, and they must not intersect each other except at their endpoints. This definition is key because it encompasses various types of polygons, such as triangles, quadrilaterals, pentagons, and so forth, each categorized by the number of sides they have.

The characteristic of being "closed" ensures that the shape is complete, with no gaps. The requirement that it is composed of straight line segments distinguishes polygons from other shapes, such as curves or irregular figures. Understanding this definition is fundamental in geometry as polygons are foundational elements in various geometric concepts and theorems.