The rectangle is marked as a red dot.
A rectangle (genagon or monogon) - a figure in geometry is a polygon with one edge and one vertex. It is indicated by the symbol {1}. It has only one side and only one internal corner .
Content
In Euclidean geometry
In Euclidean geometry, a rectangle is usually considered an impossible object, since its endpoints must coincide.
In spherical geometry
In spherical geometry, three figures with a rectangle are possible: {1,1}, {1,2}, {2,1}.
A single-angled polyhedron {1,1}, a single-angled dihedral {1,2}, a single-angled "beach ball" {2,1}
See also
- A polyhedron is a generalization of a polygon in dimension three, the surface of which is composed of polygons or its body is limited.
- Convex polygon
- Regular polygon