Answer: A regular quadrilateral is one with equal sides and equal angles, so it is a square. To negate this definition, we say an irregular quadrilateral is one where the sides are unequal or the angles are unequal OR BOTH. In simpler terms, we could say it is a quadrilateral which is not a square.
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A rectangle, by definition is an irregular quadrilateral. It has two pairs of parallel sides.
a quadrilateral
In the United States, yes its very definition is a general irregular quadrilateral. However, outside the U.S., its the same thing as a trapezoid and there are regular and irregular trapezoids.
Irregular
An irregular quadrilateral has four sides, but they can be of any length and contain any angle. An irregular quadrilateral is a four-sided polygon that is not defined as a square, rectangle, trapezoid, parallelogram, rhombus, or kite.