No, they intersect at a line.
Two straight lines, whether they're in the same or different planes, must intersect at either one point or else at no points.
no
Point.
Never.
No, 2 planes may only intersect at a line, a plane, or not at all. THREE planes may intersect at a point though...
No, perpendicular planes intercept at only one point. Parallel planes do not intersect at all.
yes, three planes can intersect in one point.
The intersection of three planes can be a plane (if they are coplanar), a line, or a point.
Yes. If two planes are not coincident (the same plane) and are not parallel, then they intersect in one straight line.
No, they intersect at a line.
No, the two planes intersect at a line, which is an infinite number of points.
Two straight lines, whether they're in the same or different planes, must intersect at either one point or else at no points.
no
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.
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.
Point.