A triad of circles tangent internally to the nine-point circle - Nikolaos Dergiades and Alexei Myakishev

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    A triad of circles tangent internally to the nine-point circle - Nikolaos Dergiades and Alexei Myakishev​

    Given an acute triangle, we construct the three circles each tangent to two sides and to the nine point circle internally. We show that the centers of these three circles are collinear.

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    LTTK CTV, 9/10/19
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