Question

Using this diagram, select the pair of lines that must be parallel.

Answer 1

The answer would be D: d || f.

Explanation:

1. Since the angles 4 and 7 are parallel, it would make sense for the lines that the angles are on to be parallel as well.
2. It just so happens that line d and line f are completely parallel to each other and angles 4 and 7 are on the lines. So the answer would be D.