olymmath

IR-TST 2021 Problem 6

  • Test 1

Point DD is chosen on the Euler line of triangle ABCABC and it is inside of the triangle. Points E,FE,F are were the line BD,CDBD,CD intersect with AC,ABAC,AB respectively. Point XX is on the line ADAD such that ∠EXF=180−∠A\angle EXF =180 - \angle A , also A,XA,X are on the same side of EFEF . If PP is the second intersection of circumcircles of CXF,BXECXF,BXE then prove the lines XP,EFXP,EF meet on the altitude of AA

Proposed by Alireza Danaie

Dataset text AI-MO AoPS. Quoted with source.

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