A quadrilateral is a polygon with four sides and angles.
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Every parallelogram must, by definition, be a quadrilateral.
Absolutely not. It's a quadrilateral by definition, and a quadrilateral by definition has four sides.
Yes, by definition a quadrilateral has four sides.
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.
A regular quadrilateral polygon