Question

a pair of vertical angles angles 1 and 2 angles 5 and 8 angles 7 and 8 angles 4 and 5

Explanation:

Step1: Recall vertical - angles definition

Vertical angles are the non - adjacent angles formed by two intersecting lines. They are opposite each other.

Step2: Analyze each pair

• Angles 1 and 2 are adjacent, so they are not vertical angles.
• Angles 5 and 8 are vertical angles as they are non - adjacent and formed by the intersection of two lines.
• Angles 7 and 8 are adjacent, so they are not vertical angles.
• Angles 4 and 5 are adjacent, so they are not vertical angles.

Answer:

angles 5 and 8