Figures {quadrangle}| can have four vertices. Quadrangles {simple quadrangle} can have four vertices and four lines, with no diagonals. Quadrangles {complete quadrangle} can have four points, four lines, and two diagonals.
Mathematical Sciences>Geometry>Plane>Polygon>Kinds>Quadrilateral
3-Geometry-Plane-Polygon-Kinds-Quadrilateral
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Date Modified: 2022.0224