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4 S^2 xyz + ∑ a^2 y z (c^2 y + b^2 z) = 0,

or equivalently

4 S^2 xyz + ∑ a^2 x (c^2 y^2 + b^2 z^2) = 0,

with S = 2*area(ABC)

X(110), X(523)

centers of the Apollonian circles

K192 is the locus of point M whose pedal circle is centered on the orthic axis. See K024 property 3.

K192 is an isogonal focal nK with root X(6), focus X(110) comparable to the Kjp cubic K024. See also Table 44.