Pentadecagon
polygon with 15 sides
A pentadecagon or quindecagon or 15-gon is a shape with 15 sides and 15 corners.
Regular pentadecagon | |
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![]() 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
changeAll sides of a regular pentadecagon are the same length. Each corner is 156°. All corners added together equal 2340°.
Area
changeThe amount of space a regular pentadecagon takes up is
a is the length of one of its sides.
Uses
change
A regular triangle, decagon, and pentadecagon can completely fill a plane vertex.