a rail-road crossing.
Two walls or a wall and floor of a room intersecting.
Yes, two planes have intersected.
Yes, two lines in intersecting planes are never skew. Skew lines are defined as lines that do not intersect and are not parallel, typically found in different planes. Since the two lines are in intersecting planes, they can either intersect or be parallel, but they cannot be skew.
wateva
Think you just answered your own question. A plane is a line. Two planes= two lines.
Two walls or a wall and floor of a room intersecting.
Not really. A railroad intersection would be an example of two lines intersecting. An example of two planes intersecting would be the ground and the side of a building or the ground and the railroad crossing sign post.
Yes, two planes have intersected.
Two lines in two intersecting planes can be parallel, intersecting, or skew.
The corner of a room is the intersection of two adjacent walls.
yes
A line, or intersecting planes.
Intersecting planes!
wateva
One.
Yes. Assuming it's a relatively standard shelf and wall.
A line. Unless the two planes are the same, in that case a plane.