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Turkey NMO 2001 Problem 5, locus of point P_G

Source: Turkey NMO 2001 Problem 5

September 30, 2011
trigonometrygeometrycircumcircleperpendicular bisectorgeometric transformationgeometry proposed

Problem Statement

Two nonperpendicular lines throught the point AA and a point FF on one of these lines different from AA are given. Let PGP_{G} be the intersection point of tangent lines at GG and FF to the circle through the point AA, FF and GG where GG is a point on the given line different from the line FAFA. What is the locus of PGP_{G} as GG varies.