Big Ideas Math: Modeling Real Life, Grade 7
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5. Finding Unknown Angle Measures
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Exercise 11 Page 394

Two angles are vertical angles if they are opposite angles formed by the intersection of two lines or line segments.

Example Solution: ∠ FAE and ∠ CAB

Practice makes perfect
Before we take a look at the given diagram, let's start by defining vertical angles.

Vertical angles

Opposite angles formed by the intersection of two lines or line segments.

Now, let's consider the given diagram.

Looking at the diagram, we see that angles ∠ FAE and ∠ CAB are opposite angles formed by the intersection of lines BE and CF. Therefore, these angles are a pair of vertical angles.