What is A closed figure made from line segments that meet at their endpoints?

A closed figure made from line segments that meet at their endpoints is known as a polygon. Polygons can have various numbers of sides, such as triangles (3 sides), quadrilaterals (4 sides), and so on. The points where the line segments meet are called vertices, and the segments themselves are referred to as edges or sides. Polygons can be classified as regular (with equal sides and angles) or irregular (with varying side lengths and angles).