olymmath

IGO 2020 I4

  • Intermediate

Triangle ABCABC is given. An arbitrary circle with center JJ , passing through BB and CC , intersects the sides ACAC and ABAB at EE and FF , respectively. Let XX be a point such that triangle FXBFXB is similar to triangle EJCEJC (with the same order) and the points XX and CC lie on the same side of the line ABAB . Similarly, let YY be a point such that triangle EYCEYC is similar to triangle FJBFJB (with the same order) and the points YY and BB lie on the same side of the line ACAC . Prove that the line XYXY passes through the orthocenter of the triangle ABCABC .

Proposed by Nguyen Van Linh - Vietnam

Dataset text AI-MO AoPS. Quoted with source.

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