olymmath

TSTST 2024 Problem 4

    Let ABCDABCD be a quadrilateral inscribed in a circle with center OO and EE be the intersection of segments ACAC and BDBD . Let ω1\omega_{1} be the circumcircle of ADEADE and ω2\omega_{2} be the circumcircle of BCEBCE . The tangent to ω1\omega_{1} at AA and the tangent to ω2\omega_{2} at CC meet at PP . The tangent to ω1\omega_{1} at DD and the tangent to ω2\omega_{2} at BB meet at QQ . Show that OP=OQOP = OQ .

    Dataset text NuminaMath olympiads. Quoted with source.

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