| Monogon | |
|---|---|
 On a circle, a monogon is a tessellation with a single vertex, and one 360-degree arc edge. | |
| Type | Regular polygon |
| Edges and vertices | 1 |
| Schläfli symbol | {1} or h{2} |
| Coxeter–Dynkin diagrams |  or   |
| Symmetry group | [ ], Cs |
| Dual polygon | Self-dual |
In geometry, a monogon, also known as a henagon, is a polygon with one edge and one vertex. It has Schläfli symbol {1}.[1]
- ^ Coxeter, Introduction to geometry, 1969, Second edition, sec 21.3 Regular maps, p. 386-388