They are two edges that make a 90 degree angle. However, the term is also loosely used for edges that make a 90 degree angle with the horizontal.
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There is no such shape as a perpendicular prism.
Parallel edges are equidistance apart whereas perpendicular edges meet at right angle as in a square or a rectangle.
Usually not, but it can.
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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