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texaschic101
< 1 and < 2 are vertical angles...because they are opposite angles made by two intersecting lines
< 3 and < 4 are adjacent....because they have a common side and a common vertex
MrRoyal

The classifications of each pair of angles are:

  1. Angles 1 and 2 are vertical angles
  2. Angles 2 and 3 are adjacent angles

From the figure, we have that:

Angles 1 and 2 are on opposite sides of a transversal, and they are equal

This means that, both angles are vertical opposite angles

Also from the figure,

Angles 3 and 4 have a common side

This means that, both angles are adjacent angles

Read more about angles at:

https://brainly.com/question/14362353

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