Well gee, let me see ... how about two of the walls of your bedroom ?
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Two planes intersect at a line
No, 2 planes may only intersect at a line, a plane, or not at all. THREE planes may intersect at a point though...
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 three-dimensional space, two planes can either:* not intersect at all, * intersect in a line, * or they can be the same plane; in this case, the intersection is an entire plane.
parralel lines