وحيد الضلع

Monogon
On a circle, a monogon is a tessellation with a single vertex, and one 360-degree arc edge.
النوع	Regular polygon
الأضلاع والرؤوس	1
رمز شلفلي	{1} or h{2}
مخططات كوكستر-دنكن	or
مجموعة التماثل	[ ], Cs

In geometry, a monogon is a curve, considered by some as a polygon with one edge and one vertex. It has Schläfli symbol {1}.

 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° lune face, and one edge (meridian) between the two vertices.

ملف:Henagonal dihedron.png Monogonal dihedron, {1,2}

Monogonal hosohedron, {2,1}

 See also

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• Digon

 References

• Herbert Busemann, The geometry of geodesics. New York, Academic Press, 1955