Heptacontagon
![](/Images/godic/202501/17/Regular_polygon_70.svg0352.png")
![The symmetries of a regular heptacontagon. Light blue lines show subgroups of index 2. The four subgraphs are positionally related by index 5 and index 7 subgroups.](/Images/godic/202501/17/Symmetries_of_heptacontagon0352.png")
In geometry, a heptacontagon (or hebdomecontagon from Ancient Greek ἑβδομήκοντα, seventy) is a seventy-sided polygon or 70-gon. The sum of any heptacontagon's interior angles is 12240 degrees.
A regular heptacontagon is represented by Schläfli symbol {70} and can also be constructed as a truncated triacontapentagon, t{35}, which alternates two types of edges.