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X(1), X(9), X(57), X(165), X(364), X(2124), X(2125), X(3062)

Foci of the Mandart ellipse (see Generalized Mandart Conics in the Downloads page and also K040)

excenters

K351 is the isogonal pK with pivot X(9), the Mittenpunkt (Lemoine point of the excentral triangle).

Its isotomic transform is pK(X76, X312).

See a generalization in CL060.

K351 is the locus of pseudo-isopivots of central psKs with center X(9). The locus of pseudo-poles is pK(X1253, X9) and the locus of pseudo-pivots is pK(X200, X8). One of these cubics is K202.

See Pseudo-Pivotal Cubics and Poristic Triangles and Central cubics.