[ª] , [©] , [^] , [¨]Tracks of incenterEexcenter / Incenter and excenter are brothers(GC World : Various Problems ,Something strange?)
It is strange when observing either the incenter or the excenter individually.
But if I think of the incenter and the excenter together, it is no longer strange.
In other words, incenter and excenter are brothers.
But why?

GC/Win


Forum of Geometric Constructor by Y.Iijima