The General Triangle Is Unique

Joachim Breitner 📧

April 1, 2011

This is a development version of this entry. It might change over time and is not stable. Please refer to release versions for citations.


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.


BSD License


Session General-Triangle