- Apr 23, 2014Antreasmove on fixed circles, whose the centers are collinear.NPC centers, orthocenters etc (same points on the Euler lines) of the triangles A'B'C'sAs the lines L1,L2,L3 move around A,B,C being parallel, the circumcenters,The reflections of L1,L2,L3 in BC,CA,AB bound a triangle A'B'C'.IN GENERAL:Let ABC be a triangle and L1,L2,L3 three parallel lines through ABC.
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