olymmath

ISL 2020 G7

    Let PP be a point on the circumcircle of an acute-angled triangle ABCA B C. Let DD, EE, and FF be the reflections of PP in the midlines of triangle ABCA B C parallel to BC,CAB C, C A, and ABA B, respectively. Denote by ωA,ωB\omega_{A}, \omega_{B}, and ωC\omega_{C} the circumcircles of triangles ADP,BEPA D P, B E P, and CFPC F P, respectively. Denote by ω\omega the circumcircle of the triangle formed by the perpendicular bisectors of segments AD,BEA D, B E and CFC F. Show that ωA,ωB,ωC\omega_{A}, \omega_{B}, \omega_{C}, and ω\omega have a common point. (Denmark)

    Dataset text NuminaMath olympiads. Quoted with source.

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