Question

three undefined terms in mathematics: i. point ii. line iii. plane 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)

Explanation:

Parallel lines are lines in a plane that never intersect, using the undefined terms line and plane. Perpendicular lines are two lines that intersect at a right - angle, using line. A line segment is a part of a line with two endpoints, using line.

Answer:

The mathematical term parallel lines explicitly uses the undefined term(s): Line, Plane.
The mathematical term perpendicular lines explicitly uses the undefined term(s): Line.
The mathematical term line segment explicitly uses the undefined term(s): Line.