An n-gon is a polygon with n sides; for example, a triangle is a 3-gonPolygons appear in rock formations, most commonly as the flat facets of crystals, where the angles between the sides depend on the type of mineral from which the crystal is made.The segments of a closed polygonal chain are called its edges or sides.Decagon (Wikipedia)
In geometry, a decagon (from the Greek δέκα déka and γωνία gonía, “ten angles”) is a ten-sided polygon or 10-gon. The total sum of the interior angles of a simple decagon is 1440°.Digon (Wikipedia)
In geometry, a bigon, digon, or a 2-gon, is a polygon with two sides (edges) and two vertices. Its construction is degenerate in a Euclidean plane because either the two sides would coincide or one or both would have to be curved; however, it can be easily visualised in elliptic space. It may also be viewed as a representation of a graph with two vertices, see “Generalized polygon”.Dodecagon (Wikipedia)
In geometry, a dodecagon, or 12-gon, is any twelve-sided polygon.Enneadecagon (Wikipedia)Hendecagon (Wikipedia)
In geometry, a hendecagon (also undecagon or endecagon) or 11-gon is an eleven-sided polygon. (The name hendecagon, from Greek hendeka “eleven” and –gon “corner”, is often preferred to the hybrid undecagon, whose first part is formed from Latin undecim “eleven”.Heptadecagon (Wikipedia)
In geometry, a heptadecagon, septadecagon or 17-gon is a seventeen-sided polygon.Heptagon (Wikipedia)
In geometry, a heptagon or septagon is a seven-sided polygon or 7-gon.Hexadecagon (Wikipedia)
In mathematics, a hexadecagon (sometimes called a hexakaidecagon or 16-gon) is a sixteen-sided polygon.Hexagon (Wikipedia)
In geometry, a hexagon (from Greek ἕξ, hex, meaning “six”, and γωνία, gonía, meaning “corner, angle”) is a six-sided polygon. The total of the internal angles of any simple (non-self-intersecting) hexagon is 720°.Icosagon (Wikipedia)
In geometry, an icosagon or 20-gon is a twenty-sided polygon. The sum of any icosagon’s interior angles is 3240 degrees.Monogon (Wikipedia)
In geometry, a monogon, also known as a henagon, is a polygon with one edge and one vertex. It has Schläfli symbol {1}.Nonagon (Wikipedia)
In geometry, a nonagon (/ˈnɒnəɡɒn/) or enneagon (/ˈɛniəɡɒn/) is a nine-sided polygon or 9-gon.Octadecagon (Wikipedia)
In geometry, an octadecagon (or octakaidecagon) or 18-gon is an eighteen-sided polygon.Octagon (Wikipedia)
In geometry, an octagon (from the Greek ὀκτάγωνον oktágōnon, “eight angles”) is an eight-sided polygon or 8-gon.Pentadecagon (Wikipedia)
In geometry, a pentadecagon or pentakaidecagon or 15-gon is a fifteen-sided polygon.Pentagon (Wikipedia)
In geometry, a pentagon (from the Greek πέντε pente meaning five and γωνία gonia meaning angle) is any five-sided polygon or 5-gon. The sum of the internal angles in a simple pentagon is 540°.Quadrilateral (Wikipedia)
In geometry a quadrilateral is a four-sided polygon, having four edges (sides) and four corners (vertices). The word is derived from the Latin words quadri, a variant of four, and latus, meaning “side”. It is also called a tetragon, derived from greek “tetra” meaning “four” and “gon” meaning “corner” or “angle”, in analogy to other polygons (e.g. pentagon). Since “gon” means “angle”, it is analogously called a quadrangle, or 4-angle. A quadrilateral with vertices A, B, C and D is sometimes denoted as ABCD.Regular polygon (Wikipedia)
In Euclidean geometry, a regular polygon is a polygon that is direct equiangular (all angles are equal in measure) and equilateral (all sides have the same length). Regular polygons may be either convex, star or skew. In the limit, a sequence of regular polygons with an increasing number of sides approximates a circle, if the perimeter or area is fixed, or a regular apeirogon (effectively a straight line), if the edge length is fixed.Tetradecagon (Wikipedia)
In geometry, a tetradecagon or tetrakaidecagon or 14-gon is a fourteen-sided polygon.Triangle (Wikipedia)
A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry. A triangle with vertices A, B, and C is denoted △ABC.Tridecagon (Wikipedia)
In geometry, a tridecagon or triskaidecagon or 13-gon is a thirteen-sided polygon.- In geometry, a polygon (/ˈpɒlɪɡɒn/) is a plane figure made up of line segments connected to form a closed polygonal chain.