What do you call a closed figure made up of three or more line segments?

A closed figure made up of three or more line segments is known as a polygon. Polygons are characterized by having straight sides and are typically classified by the number of their sides. For instance, a triangle has three sides, a quadrilateral has four, and so on. This definition encompasses a wide variety of shapes, such as pentagons and hexagons, as well.

In contrast, other choices do not fit the description of being made solely of line segments. A circle, for example, is a curved shape with no straight edges and is not composed of line segments at all. Similarly, while a quadrilateral is indeed a polygon (specifically a polygon with four sides), it does not accurately encompass the broader definition given that the question asks for a general term applicable to all closed figures with three or more line segments. A rectangle is a specific type of quadrilateral and, like the quadrilateral, it is a polygon but doesn’t represent the general category that includes all polygons. Thus, identifying the answer as a polygon is the most accurate response.