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, so they use the undefined term "line". Perpendicular lines are also defined with respect to lines, using the undefined term "line". A line - segment is part of a line and is defined using the undefined term "line".

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): Line