A minimum of 2, but an infinite number of planes can 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.
Two distinct planes will intersect in one straight line.
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.
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.
yes, it may be the two plane intersect at one line or the two planes are coincident.
-- An infinite number of different planes can intersect the same line. -- The same line can lie in an infinite number of different planes. -- An infinite number of different lines can intersect the same plane.
A line segment can be defined as having two endpoints
An 'edge' is the line in which two sides (planes) intersect.
an infinite number; no limit
There is no "the" since there are infinitely many non-parallel planes. Two non-parallel planes are planes that intersect in a line.