Monogon

In geometry, a monogon, also known as a henagon, is a polygon with one edge and one vertex. It has Schläfli symbol {1}.[1] Since a monogon has only one side and only one vertex, every monogon is regular by definition.

Monogon
On a circle, a monogon is a tessellation with a single vertex, and one 360-degree arc edge.
TypeRegular polygon
Edges and vertices1
Schläfli symbol{1} or h{2}
Coxeter diagram or
Symmetry group[ ], Cs
Dual polygonSelf-dual

In Euclidean geometry

In Euclidean geometry a monogon is a degenerate polygon because its endpoints must coincide, unlike any Euclidean line segment. Most definitions of a polygon in Euclidean geometry do not admit the monogon.

In spherical geometry

In spherical geometry, a monogon can be constructed as a vertex on a great circle (equator). This forms a dihedron, {1,2}, with two hemispherical monogonal faces which share one 360° edge and one vertex. Its dual, a hosohedron, {2,1} has two antipodal vertices at the poles, one 360 degree lune face, and one edge (meridian) between the two vertices.[1]


Monogonal dihedron, {1,2}
Monogonal hosohedron, {2,1}
gollark: Yes/
gollark: Oh wow, rustc is beeing beeoidally.
gollark: The implications are obvious.
gollark: Yet```rustfn simplify(v: &mut Value, rules: &Rules) { loop { match v { Value::Call(head, args) => { let mut was_change = false; for mut arg in args.iter_mut() { simplify(&mut arg, rules); } args.sort(); if let Some(rules) = rules.get(head) { for rule in rules.iter() { if let Some(bindings) = matches(v, &rule.condition) { *v = subst(&rule.result, &bindings); was_change = true; println!("{} -> {} on {}", rule.condition, rule.result, v); } } } if !was_change { break } }, _ => break } }}```
gollark: Stop wanting that.

See also

References
  1. Coxeter, Introduction to geometry, 1969, Second edition, sec 21.3 Regular maps, p. 386-388
  • Herbert Busemann, The geometry of geodesics. New York, Academic Press, 1955
  • Coxeter, H.S.M; Regular Polytopes (third edition). Dover Publications Inc. ISBN 0-486-61480-8
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