Yes. A line can be the intersection of two planes, or any number of planes.
A real-world example would be the central axis (axle) of a paddlewheel on a steamboat, which would be coplanar with all of the planes represented by the individual paddles.
A single line is similarly the intersection of perpendicular planes.
Two planes intersect at a line. The line where they intersect pertains to both planes. In the same manner, if infinitely many planes intersect each other at the same line, then that line pertains to the infinitely many planes.
If 2 points determine a line, then a line contains infinitely many planes.
Yes. If two planes are not coincident (the same plane) and are not parallel, then they intersect in one straight line.
A line. Unless the two planes are the same, in that case a plane.
...parallel to each other.
Two planes intersect at a line
NO, but they can intercpet in a line which is not the same as a segment of course.
A line. When two planes intersect, their intersection is a 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.
A line is the intersection of two planes. The angle between the planes is called the "dihedral angle".
Yes, the intersection of 2 planes is a line.
The intersection of two planes is a line.