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X(1), X(2), X(6), X(24), X(30), X(68), X(74), X(2931), X(3580), X(14910), X(16310)

excenters

vertices of the cevian triangle of X(3580)

O1, O2 = bicentric pair PU(4)

their isogonal conjugates at infinity, on the MacBeath circum-conic

Geometric properties :

K1169 is related to K1166. See also K1170.

K1169 is a member of the Thomson-Grebe pencil. See Table 13.

Recall that the MacBeath circum-conic has perspector X(3) and center X(6).