Non-quadrilaterals contain triangles, circles, pentagons, octagons, hexagons, and stars.
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Anything without four sides, since a quadrilateral is a polygon with all four sides. An example of a shape not a quadrilateral would be a triangle.
Congruence is a relationship between two shapes. ANY one shape cannot be congruent.
Any shape that has 4 sides is a quadrilateral such as: square, rectangle, trapezoid, rhombus, parallelogram, kite ..... etc
A kite, a parallelogram, many ordinary quadrilaterals with no specific names.
Its basically a hierarchy just for quadrilaterals.
Not all quadrilaterals are rectangles. Some quadrilaterals are rectangles, and the rest are not. However, all rectangles are quadrilaterals.