In geometry, a quadrilateral refers to a four-sided polygon, a figure having four edges or sides; it also has four corners or vertices. Examples include squares and rectangles. All of the answer options in the question refer to various types of quadrilateral.

An antiparallelogram is a special type of quadrilateral, one that is self-crossing. Like a parallelogram, an antiparallelogram has two opposite pairs of equal-length sides, but these pairs of sides are not in general parallel. Instead, sides in the longer pair cross each other as in a scissors mechanism. Antiparallelograms are also called contraparallelograms.

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