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Published online by Cambridge University Press: 03 November 2016
Let α1, β1, γ1, and α2, β2, γ2 be the complex numbers corresponding to the angular points A 1, B 1, C 1 and A 2, B 2, C 2 of two related triangles, T 1, T 2, in a plane, and let homologous vertices be denoted by the same letters.