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Regular enneadecagon
A regular enneadecagon
TypeRegular polygon
Edges and vertices19
Schläfli symbol{19}
Coxeter–Dynkin diagrams
Symmetry groupDihedral (D19), order 2×19
Internal angle (degrees)≈161.052°
PropertiesConvex, cyclic, equilateral, isogonal, isotoxal
Dual polygonSelf

In geometry, an enneadecagon, nonadecagon or 19-gon is a nineteen-sided polygon.

Regular enneadecagon

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A regular enneadecagon is represented by the Schläfli symbol {19}.