quadrangle
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Magdalen College, Oxford, quadrangle
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A plane figure consisting of four points, each of which is joined to two other points by a line segment. A quadrangle may be concave or convex depending on whether the line segments do or don't intersect. A convex quadrangle is a quadrilateral. The word is from the Latin quadrangulum for four-cornered and is also used to describe a rectangular area surrounded on all four sides by buildings, or to such buildings themselves.
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