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

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

∠ BAC and ∠ DAE, ∠ CAD and ∠ EAB

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.

We have two pairs of vertical angles. ∠ BAC and ∠ DAE && ∠ CADand ∠ EAB