Question

Which pair of undefined terms is used to define the term parallel lines?

Answer 1

After a thorough research, there exists the same question that have choices.

Point, line
Line, plane
Coplanar, line
Point, coplanar 

The correct answer is "Coplanar, Line." The pair of undefined terms that is used to define the term parallel line is "Coplanar, Line" because parallel lines are coplanar in itself that do not intersect.