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Hendecagram
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==Construction== As with all odd regular polygons and star polygons whose orders are not products of distinct [[Fermat prime]]s, the regular hendecagrams cannot be constructed with compass and straightedge.<ref>{{citation|title=Abstract Algebra: Applications to Galois Theory, Algebraic Geometry, and Cryptography|volume=11|series=Sigma series in pure mathematics|first1=Celine|last1=Carstensen|first2=Benjamin|last2=Fine|first3=Gerhard|last3=Rosenberger|publisher=[[Walter de Gruyter]]|year=2011|isbn=9783110250084|page=88|url=https://books.google.com/books?id=Xo6iSxRfXz0C&pg=PA88|quote=On the other hand a regular 11-gon is not constructible.}}</ref> However, {{harvtxt|Hilton|Pedersen|1986}} describe folding patterns for making the hendecagrams {11/3}, {11/4}, and {11/5} out of strips of paper.<ref>{{citation|last1=Hilton |first1=Peter|author1-link=Peter Hilton |last2=Pedersen |first2=Jean |author2-link=Jean Pedersen|year=1986 |title=Symmetry in mathematics |journal=Computers & Mathematics with Applications |volume=12 |issue=1β2 |doi=10.1016/0898-1221(86)90157-4 |mr=838152 |pages=315β328|doi-access= }}</ref>
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