No. By definition, planes can be extended in all directions to infinity. If they are not parallel, they will intersect somewhere.
No, perpendicular planes intercept at only one point. Parallel planes do not intersect at all.
If there are two unique, non-parallel planes in space, they will intersect, and their intersection will be a line.
Yes, there are three ways that two different planes can intersect a line: 1) Both planes intersect each other, and their intersection forms the line in the system. This system's solution will be infinite and be the line. 2) Both planes intersect the line at two different points. This system is inconsistent, and there is no solution to this system. However, both planes will still be intersecting the same line, albeit at different locations on the line. 3) Both planes intersect each other, but their intersection does NOT form the line in the system. However, if the line in the system intersects the planes' intersection, then they will all intersect a single point. The solution will be finite and be a single point. There are also 3 ways two different planes WON'T both intersect a line. 1) The two planes and the line are all parallel to each other, and none of them intersect each other. 2) The line is parallel to one plane, but intersects the other plane. 3) The same as #2, but now the line is parallel to the other plane and intersects the one plane.
A line. When two planes intersect, their intersection is a line.
parallel planes
No. Consider two adjacent faces on a cuboid. Both planes are parallel to the edge at which the intersect. But the fact that they do intersect illustrates that they are not parallel.
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.
No. By definition, planes can be extended in all directions to infinity. If they are not parallel, they will intersect somewhere.
Yes. If two planes are not coincident (the same plane) and are not parallel, then they intersect in one straight line.
Yes.
There is no "the" since there are infinitely many non-parallel planes. Two non-parallel planes are planes that intersect in a line.
We don't think so. We reasoned it out like this: -- Two planes either intersect or else they're parallel. -- If two planes intersect, then they're not parallel. -- In order for the third one to avoid intersecting either of the first two, it would have to be parallel to both of them. But if they're not parallel to each other, then that's not possible. If the third plane is parallel to one of the first two, then it's not parallel to the other one, and it must intersect the one that it's not parallel to.
No, perpendicular planes intercept at only one point. Parallel planes do not intersect at all.
Yes. If two planes are not coincident (the same plane) and are not parallel, then they intersect in one straight line.
No, they may also be parallel.
Yes providing that they are not parallel