Very special kinds of quadrilaterals are parallelograms (squares, rhombuses, rectangles, etc.), although cyclic quadrilaterals are also interesting on their own. Notice however, that there are quadrilaterals that are neither parallelograms nor cyclic quadrilaterals.
This is version 4 of quadrilateral, born on 2001-12-11, modified 2006-11-03.
Object id is 1072, canonical name is Quadrilateral.
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