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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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.
Two planes that intersect are simply called a plane to plane intersection. When they intersect, the intersection point is simply called a line.
Yes. If two planes are not coincident (the same plane) and are not parallel, then they intersect in one straight line.
If the lines are in the same plane and never intersect they are always parallel. Two line can not intersect and be parallel if they are in different planes though. Take a cube for example, if you have one Sid of it and take the edge and then go to the opposite side and make a horizontal line they will never intersect but are also not parallel.
Yes, a transversal line always intersects two parallel lines.