Two diagonals have been drawn on two faces of the cube. Using logical reasoning and lateral thinking, work out the angle between

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问题 Two diagonals have been drawn on two faces of the cube. Using logical reasoning and lateral thinking, work out the angle between the two diagonals AB and AC.

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答案60

解析 (连接BC,AB、BC、Ac等长,等边三角形内角为60度。)
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