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ISL 1970 Problem 11

    Let ABCDABCD and A′B′C′D′A'B'C'D' be two arbitrary squares in the plane that are oriented in the same direction. Prove that the quadrilateral formed by the midpoints of AA′,BB′,CC′,DD′AA',BB',CC',DD' is a square.

    Dataset text AI-MO AoPS. Quoted with source.

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