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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 |
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Geometric properties : |
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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). |