Question

in which diagram are angles 1 and 2 vertical angles?

Explanation:

Step1: Recall vertical - angle definition

Vertical angles are formed when two lines intersect. They are non - adjacent angles with a common vertex.

Step2: Analyze first diagram

In the first diagram, two lines intersect and angles 1 and 2 are non - adjacent and share a common vertex. They are vertical angles.

Step3: Analyze second diagram

In the second diagram, the angles 1 and 2 do not have two intersecting lines creating them in the proper way for vertical angles. They are adjacent in a non - vertical - angle formation.

Answer:

The first diagram.