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the same as a regular quadrilateral, 4
If the quadrilateral is in the form of a square or a rhombus they 4 equal sides.
A rectangle, by definition is an irregular quadrilateral. It has two pairs of parallel sides.
There are infinitely many possible shapes. Apart from a scalene triangle, none have a specific name. They are irregular polygons, but that is not enough. Irregular polygons can have equal sides (if there is at least one angle that is not equal to the rest) or equal angles (if there is at least one side that is not equal to the rest).
A regular polygon must have all sides (and angle) equal.An irregular polygon does not have to have all sides equal, but some may be equal.An irregular hexagon may have 2, 3, 4 or 5 equal sides.