A shape with 11 sides is called a hendecagon, or alternatively, an undecagon. This polygon has eleven straight edges and eleven vertices.
The term ‘hendecagon’ comes from the Greek word ‘hendeka’ which means eleven. In geometry, polygons are classified based on the number of sides, and as the number increases, so too does the complexity of the shape.
While hendecagons are not commonly encountered in everyday life, they can be found in certain designs and structures where a unique shape is desired. Understanding the properties of a hendecagon can be useful in various fields, including architecture and graphic design.