To provide an answer, I would need the image that you're referencing. However, vertical angles are created when two lines intersect, which means that the angles opposite each other at the intersection are equal and form a vertical pair.
If you have the angles labeled (like ∠5), the angle that forms a vertical pair with it would typically be directly across from it at the intersection point. If you can describe the arrangement of angles or provide more details, I can help identify the angle that makes a vertical pair with ∠5.