NMC 2021 Problem 4
Let and be points on the circle such that is a convex quadrilateral. Suppose that and intersect at a point such that is between and and that and intersect at a point . Let be the point on such that and are parallel. Let be the reflection of through and suppose that is inside the circle .
Show that , and are collinear.
Dataset text NuminaMath olympiads. Quoted with source.
Solutions
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