digon

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.

Etymology

di- +‎ -gon.

Pronunciation

• IPA^(key): /ˈdaɪɡən/, /ˈdaɪɡɒn/
• Hyphenation: di‧gon

Noun

digon (plural digons)

1. (geometry) A polygon having two edges and two vertices.
   • 2013, Brent Davis with Moshe Renert, The Math Teachers Know: Profound Understanding of Emergent Mathematics, New York, N.Y., Abingdon, Oxon.: Routledge, →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.

Synonyms

• bigon, biangle, diangle (less common)

Translations

polygon having two edges and two vertices

• Bengali: দ্বিভুজ (dibhuj)
• Esperanto: dulatero
• Icelandic: tvíhyrningur m
• (deprecated template usage) {{trans-mid}}
• Polish: dwukąt m
• Russian: двуугольник (ru) m (dvuugolʹnik)

Further reading

• digon on Wikipedia.Wikipedia

Anagrams

• Godin, Gondi, OD'ing, dingo, doing, doïng

---

Esperanto

Noun

digon

1. accusative singular of digo

---

Welsh

Etymology

Perhaps ultimately from Proto-Indo-European *h₁én (“produce”).

Pronunciation

• IPA^(key): /ˈdɪɡɔn/
• IPA^(key): /ˈdiːɡɔn/, /ˈdɪɡɔn/

Noun

digon m (uncountable)

1. enough, plenty, a sufficient amount

Derived terms

• digonol (“adequate”)

Adverb

digon

1. enough, sufficient

Mutation

Welsh mutation
radical	soft	nasal	aspirate
digon	ddigon	nigon	unchanged
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.