Back ثلاث عشري الأضلاع Arabic Tridecágonu AST Тринадесетоъгълник Bulgarian Tridecàgon Catalan سێزدەلا CKB Třináctiúhelník Czech Dreizehneck German Δεκατριάγωνο Greek Tridecàgon EML Tridecágono Spanish
| Regular tridecagon | |
|---|---|
 A regular tridecagon | |
| Type | Regular polygon |
| Edges and vertices | 13 |
| Schläfli symbol | {13} |
| Coxeter–Dynkin diagrams |    |
| Symmetry group | Dihedral (D13), order 2×13 |
| Internal angle (degrees) | ≈152.308° |
| Properties | Convex, cyclic, equilateral, isogonal, isotoxal |
| Dual polygon | Self |
In geometry, a tridecagon or triskaidecagon or 13-gon is a thirteen-sided polygon.