Nguyen Thanh Dung, The Feuerbach point and the Fuhrmann triangle,
Forum Geometricorum, 16 (2016) 299--311.

Abstract. We establish a few results on circles through the Feuerbach point of a triangle, and their relations to the Fuhrmann triangle. The Fuhrmann triangle is perspective with the circumcevian triangle of the incenter. We prove that the perspectrix is the tangent to the nine-point circle at the Feuerbach point.

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