- Let ABC be a triangle, A'B'C' the cevian triangle of P,
and A*B*C* the cevian triangle of P* [= isog. conj. of P]
A" = The orthogonal Projection of A* on AA'.
Ab = The orthogonal Projection of A" on AC
Ab = The Orthogonal Projection of A" on AB
L1 = The line AbAc. Similarly the lines L2, L3.
Which is the locus of P such that the lines
L1,L2,L3 are concurrent, and in general,
which is the locus of P such that the triangle
bounded by the lines L1,L2,L3 is perspective with ABC?
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