digon

English

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Wikipedia

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.

di- +‎ -gon.

Pronunciation

• IPA(key): /ˈdaɪɡən/, /ˈdaɪɡɒn/
• Hyphenation: di‧gon This entry needs audio files. If you have a microphone, please record some and upload them. (For audio required quickly, visit WT:APR.)

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 Invalid ISBN, 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.

Esperanto

Noun

digon

1. accusative singular of digo

Welsh

Etymology

From the stem of the verb digoni (to suffice, to satisfy, to satiate).

Pronunciation

• (North Wales) IPA(key): /ˈdɪɡɔn/
• (South Wales) IPA(key): /ˈdiːɡɔn/, /ˈdɪɡɔn/

Noun

digon m (uncountable)

1. enough, plenty, a sufficient amount