No. Either they do not intersect at all, or they intersect in a straight line or are the same.
No, two planes do not intersect in exactly one plane unless the planes are exactly overlapping, making one plane. In Euclidean Geometry two planes intersect in exactly one line.
Two distinct planes will intersect in one straight line.
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.
No, the two planes intersect at a line, which is an infinite number of points.
No, perpendicular planes intercept at only one point. Parallel planes do not intersect at all.
No, 2 planes may only intersect at a line, a plane, or not at all. THREE planes may intersect at a point though...
No.
Two straight lines, whether they're in the same or different planes, must intersect at either one point or else at no points.
No. The planes must either coincide (they are the same, and intersect everywhere), be parallel (never intersect), or intersect in exactly one line.
Two planes do not intersect at all if the planes are parallel in three-dimensional space.
Three planes may all intersect each other at exactly one point. This commonly occurs when there is one straight plane and two other planes intersect it at acute or obtuse angles.