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 Equilic Quadrilateral. Level: High School, SAT Prep, College geometry

Equilic quadrilateral is a quadrilateral ABCD with one pair of opposite sides equal (AB = CD) and the sum of angles A and D equal to 120.

Reference: Garfunkel, J. "The Equilic Quadrilateral." Pi Mu Epsilon J. 7, 317-329, 1981.

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