quadrilateral(redirected from Quadrialateral)
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1. having or formed by four sides
2. a polygon having four sides. A complete quadrilateral consists of four lines and their six points of intersection
A plane figure bounded by four straight lines. If two of the lines are parallel, it is a trapezium. If two pairs of lines are parallel, it is a parallelogram. An equilateral parallelogram is a rhombus. A right-angled rhombus is a square.