contraparallelogram
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Antiparallelogram — An antiparallelogram An antiparallelogram (also called a contraparallelogram[1] or crossed parallelogram[2]) is a quadrilateral in which, like a parallelogram, the p … Wikipedia
antiparallelogram — noun A quadrilateral in which the pairs of nonadjacent sides are congruent, but in which two opposite sides intersect and are therefore not parallel. Syn: contraparallelogram … Wiktionary
