English

A digon with an internal area (the green portion) can be depicted on the surface of a sphere if its vertices are antipodal (on opposite sides of the sphere). On a flat surface, a digon would look like a line.

Noun

digon ‎(plural digons)

1. (geometry) A polygon having two edges and two vertices.
   • 2013, Brent Davis; Moshe Renert, The Math Teachers Know: Profound Understanding of Emergent Mathematics, New York, N.Y.; Abingdon, Oxon.: Routledge, ISBN 978-1-415-85843-4, page 102:

     They [the students] also came upon new and unusual mathematical figures: the digon, a two-sided polygon on a spherical space, and the apeirogon, an open polygon with infinitely many sides  […]. All these discoveries brought up even more questions. Is a circle a polygon? What makes an octagon an octagon – its eight vertices, its eight sides, or both? Can a polygon cross itself? Does a polygon need to be closed?

2. (graph theory) A pair of parallel undirected edges in a multigraph.
3. (graph theory) A pair of antiparallel edges in a directed graph.

Synonyms

• bigon (less common)

Translations

External links

• digon on Wikipedia.Wikipedia

Anagrams

• dingo, doing, doïng, Gondi

Esperanto

Noun

digon

1. accusative singular of digo

Welsh

Pronunciation

• (North Wales) IPA^(key): /ˈdɨɡɔn/
• (South Wales) IPA^(key): /ˈdiɡɔn/

Adverb

digon

1. enough, sufficient

Mutation