In mathematics, a polygon is a two-dimensional closed shape bounded with straight sides. It is a flat or plane shape that does not have curved sides. The sides of a polygon are also called its edges, and the points where two sides meet are the vertices or corners of a polygon. A polygon is made up of line segments connected to each other end to end, and the minimum number of sides a polygon can have is three because it needs a minimum of three sides to be a closed shape or else it will be open. Polygons are named based on the number of sides they have, and they are generally denoted by n-gon where n represents the number of sides it has. For example, a five-sided polygon is named as 5-gon, a ten-sided is named as 10-gon, and so on. However, few polygons have some special names. If all the sides and interior angles of the polygon are equal, then it is known as a regular polygon. If all the sides and the interior angles of the polygon are of different measure, then it is known as an irregular polygon. A polygon with no angles pointing inwards is called a convex polygon, while a polygon with any internal angle greater than 180° is called a concave polygon.