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SHARYGIN 2019 Problem 8

    The circle ω1\omega_1 passes through the vertex AA of the parallelogram ABCDABCD and touches the rays CB,CDCB, CD. The circle ω2\omega_2 touches the rays AB,ADAB, AD and touches ω1\omega_1 externally at point TT. Prove that TT lies on the diagonal ACAC.

    Official text Sharygin Geometry Olympiad 2019 official paper, page 2. Quoted with source.

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