The lines of latitude, which run parallel to the equator, are referred to as parallels. They are used to measure the distance north or south of the equator in degrees. Each parallel is designated by its latitude, with the equator at 0 degrees and the poles at 90 degrees north and south.
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.
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.
There isn't a name...they're just called a pair of parallel lines.
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