Technically, that's known as an "edge" of the prism.
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That would be an edge.
They meet at an edge
An edge is the the answer
Select any vertex.There are three faces that meet at that vertex. Find the vertex at which the other three faces meet. The line joining these two vertices is the principal diagonal of the rectangular prism.
An edge is an area of a 3D figure where two faces meet to form a line segment.