A closed polygon bounded by eleven straight-line segments. The formula with which to find an equilateral undecagon's area is 9.3656 times the length of one side squared. Also see mathematics, radial, shape, and vertex.

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  • Undecagon — Un*dec a*gon, n. [L. undecim eleven + Gr. ? an angle.] (Geom.) A figure having eleven angles and eleven sides. [1913 Webster] …   The Collaborative International Dictionary of English

  • Undecagon — (Undecagōnum, lat. u. gr.), Elfeck …   Pierer's Universal-Lexikon

  • undecagon — /un dek euh gon /, n. a polygon having 11 angles and 11 sides. [1720 30; < L un , as in undecim eleven (un(us) one + decim, comb. form of decem TEN) + DECAGON] * * * …   Universalium

  • undecagon — noun A polygon with eleven sides and eleven angles. Syn: hendecagon See Also: undecagonal …   Wiktionary

  • undecagon — [ʌn dɛkəg(ə)n] noun another term for hendecagon. Origin C18: formed irregularly from L. undecim eleven , on the pattern of decagon …   English new terms dictionary

  • undecagon — un·dec·a·gon …   English syllables

  • undecagon — /ʌnˈdɛkəgɒn/ (say un dekuhgon) noun a polygon having eleven angles and eleven sides. {Latin undec(im) eleven + (dec)agon} …  

  • undecagon —   n. eleven sided plane figure …   Dictionary of difficult words

  • undecagon — n. = HENDECAGON. Etymology: L undecim eleven, after decagon …   Useful english dictionary

  • Hendecagon — In geometry, a hendecagon (also undecagon [ [http://www.mathopenref.com/undecagon.html Undecagon Definition Math Open Reference] ] ) is an 11 sided polygon. The name undecagon is often seen as incorrect, but the matter is up for debate. The… …   Wikipedia

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