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Article
Triangles and Groups via Cevians
Journal of Geometry
  • Árpád Bényi, Western Washington University
  • Branko Ćurgus, Western Washington University
Document Type
Article
Publication Date
1-1-2012
Disciplines
Abstract

For a given triangle T and a real number ρ we define Ceva’s triangle Cρ(T) to be the triangle formed by three cevians each joining a vertex of T to the point which divides the opposite side in the ratioρ: (1 – ρ). We identify the smallest interval MT⊂R such that the family Cρ(T),ρ∈MT, contains all Ceva’s triangles up to similarity. We prove that the composition of operators Cρ,ρ∈R, acting on triangles is governed by a certain group structure on R. We use this structure to prove that two triangles have the same Brocard angle if and only if a congruent copy of one of them can be recovered by sufficiently many iterations of two operators Cρ and Cξ acting on the other triangle.

Language
English
Format
application/pdf
Citation Information
Árpád Bényi and Branko Ćurgus. "Triangles and Groups via Cevians" Journal of Geometry Vol. 103 Iss. 3 (2012) p. 375 - 408
Available at: http://works.bepress.com/branko_curgus/8/