Characterizations of trapezoids - Martin Josefsson

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    Characterizations of trapezoids - Martin Josefsson​

    We review eight and prove an additional 13 necessary and sufficient conditions for a convex quadrilateral to be a trapezoid. One aim for this paper is to show that many of the known properties of trapezoids are in fact characterizations.

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    LTTK CTV, 9/10/19
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