olymmath

BALKAN 2021 Problem 1

  • Paper

Let ABCA B C be a triangle with AB<ACA B<A C. Let ω\omega be a circle passing through B,CB, C and assume that AA is inside ω\omega. Suppose X,YX, Y lie on ω\omega such that ∠BXA=∠AYC\angle B X A=\angle A Y C. Suppose also that XX and CC lie on opposite sides of the line ABA B and that YY and BB lie on opposite sides of the line ACA C.

Show that, as X,YX, Y vary on ω\omega, the line XYX Y passes through a fixed point.

Dataset text NuminaMath olympiads. Quoted with source.

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