Sherman's fourth side of a triangle - Paul Yiu

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    Sherman's fourth side of a triangle - Paul Yiu​

    We give two simple ruler-and-compass constructions of the line which, like the sidelines of the triangle, is tangent to the incircle and cuts the circumcircle in a chord with midpoint on the nine-point circle.

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    LTTK CTV, 9/10/19
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