On butterflies inscribed in a quadrilateral - Zvonko Cerin

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    On butterflies inscribed in a quadrilateral - Zvonko Cerin​

    We explore a configuration consisting of two quadrilaterals which share the intersection of diagonals. We prove results analogous to the Sidney Kung's Butterfly Theorem for Quadrilaterals in Kung, Mathematics Magazine, 78 (2005) 314--316.

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