Big Ideas Math: Modeling Real Life, Grade 7
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5. Finding Unknown Angle Measures
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Exercise 15 Page 394

Two angles are adjacent if they have a common side, a common vertex, and do not overlap. Two angles are vertical if they are non-adjacent and formed by the intersection of two straight lines or segments.

Are Angles Adjacent, Vertical, or Neither? Vertical
Explanation: See solution.

Practice makes perfect
We want to determine whether the given angles are adjacent, vertical, or neither. Let's start by recalling the definitions of adjacent angles and vertical angles.
Adjacent Angles Vertical Angles
Two angles are adjacent if they have a common side, a common vertex, and do not overlap. Two angles are vertical if they are non-adjacent and formed by the intersection of two straight lines or segments.

Let's now consider the given diagram.

angles

The two angles are on the opposite sides of the intersection of two lines. Therefore, these angles are vertical angles.