 Following common practice, "A" denotes not only the vertex but also the angle "BAC" at vertex "A", and similarly for "B" and "C" as angles in "ΔABC".Let "a" = |"BC"|, "b" = |"CA"|, "c" = |"AB"|, the sidelengths of Δ"ABC".In trilinear coordinates, the general circumconic is the locus of a variable point "X" = "x"