Which pair of undefined terms is used to define the term parallel lines?


Option A) Point and line

Option B) Plane and line

Option C) Point and ray

Option D) Ray and line

Answer: The right answer is Option B) plane and line


The pair of undefined terms used to define the term parallel lines is “plane and line”. Parallel lines are two lines that are in the same plane and do not intersect each other, no matter how far they are extended. The terms “point and line”, “point and ray”, and “ray and line” are also important undefined terms in geometry, but they are not used in the definition of parallel lines.

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