Pentacontagon
![](/Images/godic/202502/02/Regular_polygon_50.svg1533.png")
![The symmetries of a regular pentacontagon. Light blue lines show subgroups of index 2. The 3 boxed subgraphs are positionally related by index 5 subgroups.](/Images/godic/202502/02/Symmetries_of_pentacontagon1534.png")
In geometry, a pentacontagon or pentecontagon is a fifty-sided polygon or 50-gon. The sum of any pentacontagon's interior angles is 8640 degrees.
A regular pentacontagon is represented by Schläfli symbol {50} and can be constructed as a quasiregular truncated icosipentagon, t{25}, which alternates two types of edges.