|Edges and vertices||15|
|Symmetry group||Dihedral (D15), order 2×15|
|Internal angle (degrees)||156°|
|Properties||Convex, cyclic, equilateral, isogonal, isotoxal|
A pentadecagon or quindecagon or 15-gon is a shape with 15 sides and 15 corners.
Regular pentadecagon[change | change source]
All sides of a regular pentadecagon are the same length. Each corner is 156°. All corners added together equal 2340°.
Area[change | change source]
The amount of space a regular pentadecagon takes up is
a is the length of one of its sides.
Uses[change | change source]
A regular triangle, decagon, and pentadecagon can completely fill a plane vertex.