Polygons by the number of sides

Digon

In geometry, a digon 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 in elliptic space. A regular digon has both angles equal and both sides equal and is represented by Schläfli symbol {2}. It may be constructed on a sphere as a pair of 180 degree arcs connecting antipodal points, when it forms a lune. The digon is the simplest abstract polytope of rank 2. A truncated digon, t{2} is a square, {4}. An alternated digon, h{2} is a monogon, {1}. (Wikipedia).

Digon
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Related pages

Apeirogonal hosohedron | Alternation (geometry) | Face (geometry) | Vertex arrangement | Schläfli symbol | Vertex (geometry) | Spherical lune | Spherical polyhedron | Spherical geometry | Tessellation | Abstract polytope | Truncation (geometry) | Rotational symmetry | Herbert Busemann | Hosohedron | Line segment | Square | Constructible polygon | Polyhedron | Polygon | Euclidean plane | Cyclic group | Monogon | Edge (geometry) | Order-2 apeirogonal tiling | Demihypercube | Degeneracy (mathematics) | Geometry | Regular polygon | Antiprism | Antipodal point