Pentadecagon
A pentadecagon or quindecagon or 15-gon is a shape with 15 sides and 15 corners.
| Regular pentadecagon | |
|---|---|
 A regular pentadecagon | |
| Type | Regular polygon |
| Edges and vertices | 15 |
| Schläfli symbol | {15} |
| Coxeter diagram |    |
| Symmetry group | Dihedral (D15), order 2×15 |
| Internal angle (degrees) | 156° |
| Dual polygon | Self |
| Properties | Convex, cyclic, equilateral, isogonal, isotoxal |
Regular pentadecagon
All sides of a regular pentadecagon are the same length. Each corner is 156°. All corners added together equal 2340°.
Area
The amount of space a regular pentadecagon takes up is
a is the length of one of its sides.
Uses
A regular triangle, decagon, and pentadecagon can completely fill a plane vertex.
Special cases, including regular polygons with their own names, in parentheses List of polygons by number of sides | ||
| 1–10 sides |  | |
| 11–20 sides | ||
| 21–30 sides | ||
| 31–40 sides | ||
| 41–50 sides | ||
| 51–100 sides (selected) | ||
| Star polygons (5–14 sides) | ||
| >100 sides | ||
| Triangles | ||
| Quadrilaterals | ||
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