A non-regular quadrilateral is one where all the sides are not the same length.
Therefore any rectangle (that is not technically a square) is a non-regular quadrilateral.
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A quadrilateral has 4 sides.
A rectangle is considered to be an irregular polygon. This is because, in a rectangle, the sides need not necessarily all be congruent, and regular polygons must have all sides be congruent.
The sides of a rectangle are not all equal so a rectangle is not a regular polygon. And, as a consequence, any 3-dimensional shape made from rectangles cannot be a regular polyhedron.
A rectangle has 4 right angles whereas a regular 5 sided pentagon has no right angles.
It is a square