Question

The mathematical term parallel lines explicitly uses the undefined term

Answer 1

Two or more lines in a plane are said to be parallel if the lines does not meet or intersect at any point in the plane.

The lines are always of the same distance from each other at any point in the plane.

Answer 2

If this is for the question:

The mathematical term parallel lines explicitly uses the undefined term(s) .

The mathematical term perpendicular lines explicitly uses the undefined term(s) .

The mathematical term line segment explicitly uses the undefined term(s) .

The answer is: 2 and 3, 2 only, 1 and 2.