Coplanar lines that do not intersect (have no common point) are parallel.
Two objects are coplanar if they both lie in the same plane, they must either intersect or be parallel.
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It is a tranversal.
Alternate Interior Angles
Coplanar lines are 2 or more lines located on the same plane. Ex.: If you draw 2 or more lines on a graph, they are all coplanar (the plane they are all on is the piece of paper you drew the graph on).
...must be coplanar.
Yes. Although, they could be coincident which may not be covered by either of these descriptions.