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

in STEMGeekslast month

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.

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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