What is a polygon?

A polygon is defined as a closed figure formed by three or more line segments, where each segment meets the next at a vertex, and the first and last segments are connected to create a closed shape. This definition emphasizes the key characteristics of polygons—specifically, the use of straight line segments and the requirement for the figure to be closed, distinguishing them from other shapes that may include curves or different dimensional properties.

In this context, options that describe polygons inaccurately include those suggesting three-dimensional shapes or figures composed of linear equations without specific reference to closed, linear arrangements. The mention of a circle further highlights the distinction, as circles are not formed by line segments and lack vertices, thereby reinforcing the uniqueness of what constitutes a polygon.