A line or edge.
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ONLY a line can be formed by the intersection of two planes...and always.
It is a line.
The intersection of two planes is never a point. It's usually a line. But if the planes have identical characteristics, then their intersection is a plane. And if the planes are parallel, then there's no intersection.
Angles are formed by the intersection of two planes.
The intersection of two lines can be any of the following:NothingA single pointAn entire line (that means the two lines are NOT distinct)