Question Video: Completing a Statement About Parallel Lines Mathematics • First Year of Preparatory School

Video Transcript

Fill in the blank. If line 𝐴𝐵 is parallel to line 𝐶𝐷 and line 𝐴𝐵 is parallel to line 𝐸𝐹, then line 𝐶𝐷 is what to line 𝐸𝐹.

We first recall that if two lines are parallel to the same line, then they must be parallel. Since both lines 𝐶𝐷 and 𝐸𝐹 are parallel to the same line, 𝐴𝐵, we must have that the two lines are parallel. Hence, the answer is that line 𝐶𝐷 is parallel to line 𝐸𝐹, denoted as shown.