A 15-sided polygon, sometimes also called the pentakaidecagon. For a regular pentadecagon with side length 1, the inradius 
, circumradius 
, and area 
are
 |  |  |
(1)
|
 |  |  |
(2)
|
 |  |  |
(3)
|
Pentadecagon
See also
Polygon, Regular Polygon, Trigonometry Angles--Pi/15Explore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Pentadecagon." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Pentadecagon.html