Todor Zaharinov, Orthopoles, flanks, and Vecten points,
Forum Geometricorum, 17 (2017) 401--410.

Abstract. Erect a square outwardly (or inwardly) from each side of the triangle. For the flank lines construct orthopoles. The lines from this orthopoles to corresponding vertexes of triangle concur in the Vecten point (or in the Inner Vecten point). This fact is showing together with a number of other interesting results, which include complex coordinates of Vecten points and orthopole.

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