Some applications of trilinear coordinates Original Research Article

In terms of a triangle ABC in the complex Euclidean plane, a formula is found for the coordinates of the unique pair of isogonal conjugate points on a given line. When the given line is at infinity, the two conjugate points are seen to be Ponceletʹs “circular” points, with the surprisingly simple coordinates (e±Bi, eminus-or-plus signAi, − 1).