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angle wanted, square related

Source: II May Olympiad (Olimpiada de Mayo) 1996 L2 P4

September 17, 2022
geometryanglessquare

Problem Statement

Let ABCDABCD be a square and let point FF be any point on side BCBC. Let the line perpendicular to DFDF, that passes through BB, intersect line DCDC at QQ. What is value of ∠FQC\angle FQC?
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