Incircle, Excircle, Altitude

Autor:Steve Phelps

The center of incircle, tangent point of excircle, and midpoint of altitude are collinear. The center of excircle, tangent point of incircle, and midpoint of altitude are collinear.

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Area Between Two Curves
Tetrahedron String Art
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Neuberg's Theorem

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tangent from external point
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