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.
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Never.
No. The planes must either coincide (they are the same, and intersect everywhere), be parallel (never intersect), or intersect in exactly one line.
A dihedral angle is the angle between two intersecting planes.
no
Two planes do not intersect at all if the planes are parallel in three-dimensional space.