Answer:
1 and 6.
Explanation:
Vertical angles are angles directly opposite to each other. Let's go through each of the answer choices.
9 and 13.
9 and 13 are adjacent/supplementary angles. They are not directly opposite from each other.
1 and 6.
1 and 6 are directly opposite from each other. Thus, they are indeed vertical angles. This is the correct choice.
7 and 14.
7 and 14 share no relationship.
3 and 6.
Again, 3 and 6 are simply adjacent angles. They are not directly opposite from each other, so they are not vertical.