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Where do two planes intersect?
In geometry, two planes intersect in a line. The only time this is not true is if the two planes are parallel to each other.
What do you call two planes that intersect?
Two planes that intersect are simply called a plane to plane intersection. When they intersect, the intersection point is simply called a line.
If two planes intersect than they intersect at exactaly one point?
Yes. If two planes are not coincident (the same plane) and are not parallel, then they intersect in one straight line.
Can two lines never intersect but not be parallel?
If the lines are in the same plane and never intersect they are always parallel. Two line can not intersect and be parallel if they are in different planes though. Take a cube for example, if you have one Sid of it and take the edge and then go to the opposite side and make a horizontal line they will never intersect but are also not parallel.
Does a transversal line have to intersect with two parallel lines?
Yes, a transversal line always intersects two parallel lines.
