, or Quadrangular figure, in Geometry, is a plane figure having four angles; and consequently four fides also.
To the class of Quadrangles belong the square, parallelogram, trapezium, rhombus, and rhomboides.— A square is a regular Quadrangle; a trapezium an irregular one.
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Entry taken from A Mathematical and Philosophical Dictionary, by Charles Hutton, 1796.
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