Technically, that's known as an "edge" of the prism.
That would be an edge.
They meet at an edge
edge
Edge. (:
An edge is the the answer
An edge of any solid shape is the line where two faces meet.
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.
EDGE
Edge
An octagon has 8 faces and 8 edges. Each face of an octagon is a straight line segment, and each edge is a line segment where two faces meet. The total number of faces and edges in an octagon can be calculated by adding the number of faces and edges together, which equals 16.