(3)... Let PaPbPc the antipedal triangle of P. Which is the locus of P such that the parallels to Ra,Rb,Rc through Pa, Pb, Pc, resp. are concurrent? The whole
(7)[APH]: Let ABC be a triangle and A'B'C' the cevian triangle of I. Denote: Bc, Cb = the reflections of B, C in CC', BB', resp. Oa = the circumcenter of ABcCb.
(4)Circumcenter lies on Brocard axis Let $ABC$ be a triangle and $P$ is a point lies on Brocard axis. $PA,PB,PC$ intersect the Appollonius circles with respect to
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