Hendecagram
In geometry, a hendecagram (also endecagram or endekagram) is a star polygon that has eleven vertices.
| Hendecagram | |
|---|---|
The four regular hendecagrams | |
| Edges and vertices | 11 |
| Schläfli symbol | {11/2}, {11/3} {11/4}, {11/5} |
| Coxeter–Dynkin diagrams | , , |
| Symmetry group | Dih11, order 22 |
| Internal angle (degrees) | ≈114.545° {11/2} ≈81.8182° {11/3} ≈49.0909° {11/4} ≈16.3636° {11/5} |
The name hendecagram combines a Greek numeral prefix, hendeca-, with the Greek suffix -gram. The hendeca- prefix derives from Greek ἕνδεκα (ἕν + δέκα, one + ten) meaning "eleven". The -gram suffix derives from γραμμῆς (grammēs) meaning a line.
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