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 Definition Two-dimensional geometric closed figure bounded by a continuous set of line segments. [d] [e]
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As far as I understand things, Euclid distinguished between triangles and polygons. Those two categories are covered by the term rectilinear figure --Miguel Adérito Trigueira 09:20, 18 August 2008 (CDT)

I can't tell you what Euclid said about triangles versus polygons, but I'm fairly certain that pretty much all modern math assumes that the set of triangles is a subset of the set of polygons. Anthony Argyriou 16:43, 21 August 2008 (CDT)