[En-ua] Solve it if you are very smart - Розв'яжіть це якщо дуже розумні

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The square A1B1C1D is rotated around the vertex D so that the points A1C1B are on the same line. At what angle did the square return?

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My solution - then.


[UA]
Квадрат A1B1C1D повернули навколо вершини D так, що вершини A1C1D лягли на одну пряму.

На скільки градусів повернули квадрат?

Моє розв'язування - згодом.



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