Greek Numerical Prefixes
Here is a list of common Greek prefixes used in naming polygons and polyhedra. Follow with -gon for a plane figure or with -hedron for a polyhedron. Build up names in the same order as in English, for example a 128-sided polygon is called a hecatoicosioctagon.
1
mono- 2 di
- 3 tri
- 4 tetra
- 5 penta
- 6 hexa
- 7 hepta
- 8 octa
- 9 ennea
- 10 deca
- 11 hendeca
- 12 dodeca
- 13 triskaideca
- 14 tetrakaideca
- 15 pentakaideca
- 16 hexakaideca
- 17 heptakaideca
- 18 octakaideca
- 19 enneakaideca
- 20 icosa (or icosi)
- 24 icositetra
- 30 triconta or triaconta
- 40 tetraconta
- 50 pentaconta
- 60 hexeconta (or hexaconta)
- 70 heptaconta
- 80 octaconta
- 90 enneaconta
- 100 hecto or hecato