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Quadrilateral

quadrilateral

1. (Science: geometry) A plane figure having four sides, and consequently four angles; a quadrangular figure; any figure formed by four lines.

2. An area defended by four fortresses supporting each other; as, the venetian quadrilateral, comprising mantua, Peschiera, Verona, and Legnano.

(Science: geometry) Complete quadrilateral, the figure made up of the six straight lines that can be drawn through four points, A, B, C, I, the lines being supposed to be produced indefinitely.


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