r1331

Let p, Q be two points. The B-cevians and the C-cevians of P, Q intersect at A', A". Define analogously B', B", C', C". The triangles ABC, A'B'C' , A"B"C" are triply perspective with centers P, Q and three additional points X, Y, Z so that the twelve points A, B, C, A', B', C', A", B", C", X, Y, Z form a desmic structure. If P, Q are isogonal (resp. isotomic), X and Y are also isogonal (resp. isotomic).


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