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IT-CESENATICO 2013 Problem 5

    ABCABC is an isosceles triangle with AB=ACAB=AC and the angle in AA is less than 60∘60^{\circ} . Let DD be a point on ACAC such that ∠DBC=∠BAC\angle{DBC}=\angle{BAC} . EE is the intersection between the perpendicular bisector of BDBD and the line parallel to BCBC passing through AA . FF is a point on the line ACAC such that FA=2ACFA=2AC ( AA is between FF and CC ). Show that EBEB and ACAC are parallel and that the perpendicular from FF to ABAB , the perpendicular from EE to ACAC and BDBD are concurrent.

    Dataset text AI-MO AoPS. Quoted with source.

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