IT-CESENATICO 2013 Problem 5
is an isosceles triangle with and the angle in is less than . Let be a point on such that . is the intersection between the perpendicular bisector of and the line parallel to passing through . is a point on the line such that ( is between and ). Show that and are parallel and that the perpendicular from to , the perpendicular from to and are concurrent.
Dataset text AI-MO AoPS. Quoted with source.
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