Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A polygon with ten sides and ten angles.

from The Century Dictionary.

  • noun In geometry, a plane figure having ten sides and ten angles. When all the sides and angles are equal, it is a regular decagon.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Geom.) A plane figure having ten sides and ten angles; any figure having ten angles. A regular decagon is one that has all its sides and angles equal.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun geometry A polygon with ten sides and ten angles.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a polygon with 10 sides and 10 angles

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Medieval Latin decagōnum, from Greek dekagōnon, from neuter of dekagōnos, having ten angles : deka, ten; see dekm̥ in Indo-European roots + -gōnos, angled; see –gon.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

deca- + -gon

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Examples

  • In Friday's edition of the journal Science, Lu and Princeton physicist Paul Steinhardt report finding a set of polygon-shaped tiles — a decagon, pentagon, diamond, bowtie and hexagon — that were arranged into distinctive patterns found on major Islamic buildings from the 12th through 15th centuries.

    Geometry Meets Arts in Islamic Tiles JDsg 2007

  • To put it simply, this bike climbs like a squirrel, descends like a greased squirrel on a luge, corners like a decagon, and accelerates like a methamphetamine-addicted rabbit.

    Happy Birthday To Me: BSNYC Turns 1 BikeSnobNYC 2008

  • Running through each polygon a decagon, pentagon, diamond, bowtie or hexagon is a decorative line.

    Archive 2007-02-01 2007

  • Running through each polygon a decagon, pentagon, diamond, bowtie or hexagon is a decorative line.

    Another article on Islamic mathematical find 2007

  • In Friday's edition of the journal Science, Lu and Princeton physicist Paul Steinhardt report finding a set of polygon-shaped tiles -- a decagon, pentagon, diamond, bowtie and hexagon -- that were arranged into distinctive patterns found on major Islamic buildings from the 12th through 15th centuries.

    Archive 2007-02-01 2007

  • These mosaics are formed from five polygons -- a decagon, a pentagon, a lozenge, a hexagon and a triangle -- each representing a unique decorative motif.

    Archive 2007-02-01 2007

  • In Friday's edition of the journal Science, Lu and Princeton physicist Paul Steinhardt report finding a set of polygon-shaped tiles -- a decagon, pentagon, diamond, bowtie and hexagon -- that were arranged into distinctive patterns found on major Islamic buildings from the 12th through 15th centuries.

    Medieval Muslims made stunning math breakthrough 2007

  • Art historians have until now assumed that the intricate tilework had been created using straight edges and compasses, but the study in Science suggests the Islamic artisans were using a basic toolkit of girih tiles made up of shapes such as the decagon, pentagon, diamond and hexagon.

    Islamic artists were 500 years ahead of Western scientists 2007

  • These mosaics are formed from five polygons -- a decagon, a pentagon, a lozenge, a hexagon and a triangle -- each representing a unique decorative motif.

    Medieval Muslims made stunning math breakthrough 2007

  • Art historians have until now assumed that the intricate tilework had been created using straight edges and compasses, but the study in Science suggests the Islamic artisans were using a basic toolkit of girih tiles made up of shapes such as the decagon, pentagon, diamond and hexagon.

    Archive 2007-02-01 2007

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