edge
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As long as they are not parallel, they will meet at an "edge", which is just a straight line.
If the faces are flat, it's a line.
Yes. I think of an edge as a line. The edges meet at vertices, and the faces meet at edges.
An angle is formed when two lines meet at a point.
triangle * * * * * What? Two lines can make an angle, but how can they make a triangle?