how many sides does a hendecagon
A hendecagon is an 11-sided polygon, also variously known as the undecagon or unidecagon. The term hendecagon is preferable to the other two since it uses the Greek prefix and suffix instead of mixing a Roman prefix and Greek suffix. The regular 11-sided polygon has SchlÃ¤fli symbol . The regular hendecagon cannot be constructed using the classical Greek rules of geometric construction.