Question

1. select 2 that apply. which angles are vertical angles? __ and __

□ ∠7
□ ∠5
□ ∠1
□ ∠9

Explanation:

Step1: Recall vertical angles definition

Vertical angles are opposite angles formed by two intersecting lines, and they are equal.

Step2: Analyze the diagram

Looking at the lines, \(\angle7\) and \(\angle9\) are formed by the intersection of two lines, so they are vertical angles. Also, check other angles: \(\angle5\) and \(\angle2\) (not in options), \(\angle1\) with others. So from the options, \(\angle7\) and \(\angle9\) are vertical angles.

Answer:

\(\angle7\) and \(\angle9\) (So the selected options are \(\boldsymbol{\angle7}\) and \(\boldsymbol{\angle9}\))