Categories: Polygons | Geometry stubs Look up polygon in Wiktionary, the free dictionary. ... A triangle is one of the basic shapes of geometry: a polygon with three vertices and three sides which are straight line segments. ... In geometry, a quadrilateral is a polygon with four sides and four vertices. ... Look up pentagon in Wiktionary, the free dictionary. ... A regular hexagon In geometry, a hexagon is a polygon with six edges and six vertices. ... Look up Heptagon in Wiktionary, the free dictionary. ... A regular octagon. ... A regular enneagon. ... An image of a Regular Decagon In geometry, a decagon is any polygon with ten sides and ten angles, and usually refers to a regular decagon, having all sides of equal length and all angles equal to 144°. Its Schläfli symbol is {10}. The area of a regular decagon... Categories: Math stubs | Polygons ... A regular dodecagon In geometry, a dodecagon is a polygon with exactly twelve sides. ... A regular triskaidecagon. ... In geometry, a pentadecagon is any 15-sided, 15-angled, polygon. ... In mathematics, a Hexadecagon (sometimes called a hexakaidecagon) is a polygon with 16 sides and 16 angles. ... Erchingers heptadecagon In geometry, a heptadecagon (or 17-gon) is a seventeen-sided polygon. ... In geometry, an icosagon is a twenty-sided polygon. ... Image:Triacontagon. ... A pentacontagon is a polygon with 50 sides. ... A hectagon is a polygon with 100 edges. ... In geometry, a chiliagon (pronounced /ˈkɪli. ... In geometry, a myriagon is a polygon with 10,000 sides. ...