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.

Answer 2

Answer: A point and a line.

Step-by-step explanation:

There are three undefined terms in geometry which is used to define other terms:

a) Point b) line c) Plane

The definition of parallel lines says that "The two lines are said to be parallel lines if they do not intersect each other at any point. "

Thus, to define parallel lines we have used only two undefined terms i.e. lines and a point .

Hence, the pair of undefined terms is used to define the term parallel lines : Point and Line