出典:Wiktionary
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From di- (prefix meaning ‘two’) + -gon (suffix forming the names of plane figures containing a given number of angles).
digon (複数形 digons)
出典:Wikipedia
出典:『Wikipedia』 (2011/07/13 22:14 UTC 版)
In geometry, a digon is a polygon with two sides (edges) and two vertices. It is degenerate in a Euclidean space, but may be non-degenerate in a spherical space.