Yes, a parallelogram is an irregular polygon because its sides and angles are not all the same. For a shape to be a regular polygon it must be equangular (all angles are the same) and equilateral (all sides have the same length).
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A irregular nonagon is a polygon that is not a regular polygon.
irregular
Any irregular polygon does not have equal sides and equal interior angles
It is called an irregular polygon. However, an irregular polygon can have congruent sides if all angles are not equal.