Two planes that intersect are simply called a plane to plane intersection. When they intersect, the intersection point is simply called a line.
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In geometry, two planes intersect in a line. The only time this is not true is if the two planes are parallel to each other.
Yes. If two planes are not coincident (the same plane) and are not parallel, then they intersect in one straight line.
Some planes are parallel and don't intersect at all. Those that do intersect (and that are not coincident, i.e. the same plane) intersect in a line.
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