Any line that is not parallel to the given lines. The transversal that contains the shortest distance between the two parallel lines, is perpendicular to them.
They do not have any specific name.
Transversal lines are not parallel and so have a gradient that is different to that of the given lines.
zero
Take any two lines and look at their slopes. -- If the slopes are equal, then the lines are parallel. -- If the product of the slopes is -1, then the lines are perpendicular.
There isn't a name...they're just called a pair of parallel lines.
Assume there are no lines through a given point that is parallel to a given line or assume that there are many lines through a given point that are parallel to a given line. There exist a line l and a point P not on l such that either there is no line m parallel to l through P or there are two distinct lines m and n parallel to l through P.
Any line that is not parallel to the given lines. The transversal that contains the shortest distance between the two parallel lines, is perpendicular to them.
They do not have any specific name.
Transversal lines are not parallel and so have a gradient that is different to that of the given lines.
zero
Take any two lines and look at their slopes. -- If the slopes are equal, then the lines are parallel. -- If the product of the slopes is -1, then the lines are perpendicular.
Skew lines
the lines are parallel.
Yes, all vertical lines are parallel, for a given coordinate system.
none
it is rhombus