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

[sergeyk]

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?

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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