Two planes intersecting could look like an X and then a third one could go right down the middle.
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It looks like an L or a large + and the lines intersect each other at 90 degrees
Just like this: ___________________ ____________________ parallel means they never intersect (touch)
Two lines that coincide look and act exactly like a single line. If you have one straight line, there are an infinite number of planes in which it lies.
They are straight lines that intersect each other at 90 degrees
Two lines, in 3-dimensional space must either intersect, be parallel or be skew. In the first two cases, they are coplanar which leaves skew lines.One way to "see" what they look like is to imagine you are standing in a cuboid room. Consider the edge where the walls on your left and the one facing you meet. Next, consider any non-vertical line of the wall to your right. [A vertical line will be parallel to the first]. These two lines will be skew. They are not parallel and also they never intersect.