Sirko
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[EN] Problem: At what angle is the square rotated? (solving)[UA] Задача: На який кут повернули квадрат?
[EN] The square A1B1C1D is rotated around the vertex D so that the points A1C1B are on the same line. What angle did the square turn? [UA] Квадрат A1B1C1D повернули навколо вершини D так, що вершини A1C1D