Sándor Nagydobai Kiss,
On the cyclic quadrilaterals with the same Varignon parallelogram,
Forum Geometricorum, 18 (2018) 103--113.

Abstract. The circumcenters and anticenters of the quadrilaterals cyclic PQRS with the same Varignon parallelogram describe an hyperbola Γ. We propose the characterization of this hyperbola. The vertices of PQRS one by one move also on hyperbolas which are the translations of hyperbola Γ.

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