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 defined in terms of lines (an undefined term), as they are lines that never intersect. Perpendicular lines are defined using the concept of angles formed by lines (an undefined term). A line - segment is part of a line (an undefined term) and is defined by two endpoints (points are undefined terms).

Answer:

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