parallel
Lines
They can be, but not necessarily. If two lines in the same plane never intersect, they are parallel. Though, two lines can exist in the same plane without being parallel. Ie, two lines that intersect at a 90 degree angle are perpendicular. Most lines in a plane aren't parallel.
parallel lines If they are not on the same plane and never intersect they are skew
parallel lines :)
parallel lines
If the two lines lie in the same plane, and they do not intersect, then they are parallel. If they are not in the same plane, and do not intersect, then they are called skew lines.
parallel lines
Parallel lines
Two lines that do not intersect on the same plane are Parallel lines.
Two lines that are in the same plane and never intersect are called "Parallel," meaning that they are lines with the same slope, but not y-intersect.
parallel
Coplanar lines that do not intersect are parallel. Non-coplanar lines that do not intersect are called skew lines.
Lines
Two coplanar (in the same plane) lines that don't meet are parallel.
They can be, but not necessarily. If two lines in the same plane never intersect, they are parallel. Though, two lines can exist in the same plane without being parallel. Ie, two lines that intersect at a 90 degree angle are perpendicular. Most lines in a plane aren't parallel.
Skew. If they are in the same plane they are called parallel.