| decagon | <geometry> 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. Origin: Pref. Deca- + Gr. A corner or angle: cf. F. Decagone. Source: Websters Dictionary (01 Mar 1998) |
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| decagon | a polygon with 10 sides and 10 angles |
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