Monogon: Difference between revisions
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{{Infobox polygon |
{{Infobox polygon |
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| name = Monogon |
| name = Monogon |
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| image = |
| image = Monogon.svg |
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| caption = On a circle, a '''monogon''' is a [[tessellation]] with a single vertex, and one 360-degree arc edge. |
| caption = On a circle, a '''monogon''' is a [[tessellation]] with a single vertex, and one 360-degree arc edge. |
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| type = [[Regular polygon]] |
| type = [[Regular polygon]] |
Revision as of 19:56, 30 December 2017
Monogon | |
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Typ | Regular polygon |
Edges and vertices | 1 |
Schläfli symbol | {1} or h{2} |
Coxeter–Dynkin diagrams | oder |
Symmetry group | [ ], Cs |
Dual polygon | Self-dual |
In geometry a monogon 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.
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} |
See also
References
- 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