+An 11-sided shape is a [polygon](/wiki/polygon) with eleven straight sides and eleven angles. This geometric figure is formally known as a [hendecagon](/wiki/hendecagon) or undecagon, defined by its vertices and edges in a two-dimensional plane. Its internal angles sum to 1620 degrees.
+## See also
+- [Geometry](/wiki/geometry)
+- [Polygon](/wiki/polygon)
+- [Side](/wiki/side)
... 1 more lines