Which Pair of Undefined Terms is Used to Define the Term Parallel Lines? #1526

In geometry, certain concepts are considered undefined terms as they do not have explicit definitions but are grasped through intuitive understanding. One such concept is the term "parallel lines." To define parallel lines, a pair of specific undefined terms, "line" and "angle," are employed. Parallel lines are defined as two lines in the same plane that never intersect, no matter how far they extend. This definition relies on the understanding of the undefined terms "line" and "angle." By comprehending the fundamental properties of lines and angles, we can establish the concept of parallel lines and recognize their consistent distance apart. So, to answer the question, Which Pair of Undefined Terms is Used to Define the Term Parallel Lines? it is the combination of "line" and "angle" that forms the foundation of this geometric concept.