| Regular 257-gon | |
|---|---|
 A regular 257-gon | |
| Type | Regular polygon |
| Edges and vertices | 257 |
| Schläfli symbol | {257} |
| Coxeter–Dynkin diagrams |      |
| Symmetry group | Dihedral (D257), order 2×257 |
| Internal angle (degrees) | ≈178.599° |
| Properties | Convex, cyclic, equilateral, isogonal, isotoxal |
| Dual polygon | Self |
In geometry, a 257-gon is a polygon with 257 sides. The sum of the interior angles of any non-self-intersecting 257-gon is 45,900°.