Each of the 12 edges of a cube is directly perpendicular to four others (two at each vertex for that edge).
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A cube has 12 edges, and each edge is perpendicular to 4 other edges. However, since each perpendicular relationship is counted twice (once for each edge), the total number of unique perpendicular line segments in a cube is 12. Thus, a cube has 12 perpendicular line segments.
Yes
A cube has 12 edges.
the square root of the sum of the squares of three perpendicular edges.