Examples of Concave QuadrilateralsDart (Arrowhead) – May isang interior angle na mas malaki sa 180°, parang pana o arrowhead ang itsura.Irregular concave quadrilateral – Anumang quadrilateral na may isang “nakausling” sulok o indent sa loob.Key TraitA concave quadrilateral always has one angle greater than 180° and at least one diagonal that lies outside the shape. Unlike squares or rectangles (na convex), concave shapes look "pushed in" or may parang kagat.