Similar metric characterizations of tangential and extangential quadrilaterals - Martin Josefsson

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    Similar metric characterizations of tangential and extangential quadrilaterals - Martin Josefsson​

    We prove five necessary and sufficient conditions for a convex quadrilateral to have an excircle and compare them to similar conditions for a quadrilateral to have an incircle.

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    LTTK CTV, 9/10/19
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