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X(1), X(3), X(4), X(1113), X(1114), X(2574), X(2575), X(5000), X(5001) excenters antipoints, see Table 77 Ha, Hb, Hc : vertices of the orthic triangle Ka, Kb, Kc : feet of the Lemoine axis (centers of the apollonian circles) foci of the Kellipse (inellipse with center K when the triangle ABC is acute angle) E1, E2 see below 

Q021 is a bicircular isogonal sextic. It is the locus of P such that the orthotransversals of P and its isogonal conjugate P* are parallel. See also Q022. Another description is the following : P, H and the orthocenter of the circumcevian triangle of P are collinear if and only if P lies on Q021 (together with the line at infinity). Compare Q021 and Q019, Q024. See also Panchapakesan isogonal sextics at Q170.

