Let Ha, Hb and
Hc be the vertices of the orthic triangle;
Ia, Ib and Ic the vertices of the incentric
triangle; CA, CB and CC the vertices of the intouch
triangle. The lines HbHc, IbIc and CbCc concur at A'. Analogously we
define B' and C'. The points A', B' and C' are the Pelletier points of
the triangle ABC and are the vertices of the Pelletier triangle.
