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Hendecagram
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==Regular hendecagrams== There are four '''regular hendecagrams''',<ref>{{citation|title=Geometry: an investigative approach|first1=Phares G.|last1=O'Daffer|first2=Stanley R.|last2=Clemens|publisher=[[Addison-Wesley]]|year=1976|isbn=9780201054200|at=[https://archive.org/details/geometry00odaf/page/ Exercise 7, p. 62]|url-access=registration|url=https://archive.org/details/geometry00odaf/page/}}.</ref> which can be described by the notation {11/2}, {11/3}, {11/4}, and {11/5}; in this notation, the number after the slash indicates the number of steps between pairs of points that are connected by edges. These same four forms can also be considered as [[Stellation#Stellating polygons|stellations]] of a regular [[hendecagon]].<ref>{{citation|title=Elementary Geometry|volume=43|series=Student mathematical library|publisher=[[American Mathematical Society]]|first1=Ilka|last1=Agricola|author1-link= Ilka Agricola |first2=Thomas|last2=Friedrich|year=2008|isbn=9780821890677|page=96|url=https://books.google.com/books?id=Ts20OwbWfPkC&pg=PA96}}.</ref> Since 11 is prime, all hendecagrams are star polygons and not compound figures.
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