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The General Triangle Is Unique

Title: The General Triangle Is Unique
Author: Joachim Breitner (mail /at/ joachim-breitner /dot/ de)
Submission date: 2011-04-01
Abstract: Some acute-angled triangles are special, e.g. right-angled or isoscele triangles. Some are not of this kind, but, without measuring angles, look as if they were. In that sense, there is exactly one general triangle. This well-known fact is proven here formally.
BibTeX:
@article{General-Triangle-AFP,
  author  = {Joachim Breitner},
  title   = {The General Triangle Is Unique},
  journal = {Archive of Formal Proofs},
  month   = apr,
  year    = 2011,
  note    = {\url{http://afp.sf.net/entries/General-Triangle.shtml},
            Formal proof development},
  ISSN    = {2150-914x},
}
License: BSD License