No, they can intersect at infinitely many points.
No, perpendicular planes intercept at only one point. Parallel planes do not intersect at all.
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.
Two distinct planes will intersect in one straight line.
2
They need not intersect at all, but if they do, it will be along a straight line and so comprise infinitely many points.
No, they can intersect at infinitely many points.
No, perpendicular planes intercept at only one point. Parallel planes do not intersect at all.
Infinitely many planes may contain the same three collinear points if the planes all intersect at the same line.
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.
Yes they can. In fact, infinitely many planes can intersect in one line, at least theoretically.
No. Two planes may be parallel and so may not intersect. Also, any line is the intersection of infinitely many planes, not just two.
There is no "the" since there are infinitely many non-parallel planes. Two non-parallel planes are planes that intersect in a line.
Two lines can intersect at none, one or infinitely many points.
None. In conventional geometry, any intersection of two planes defines a line, which is an infinite number of points. Many planes may intersect along a single line, or any pair of planes may intersect creating a unique line, but however they intersect, the number of shared points is infinite. If the the planes do not intersect (if they are parallel), then they share zero points.
If 2 points determine a line, then a line contains infinitely many planes.
Infinitely many planes.