Big Ideas Math: Modeling Real Life, Grade 7
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5. Finding Unknown Angle Measures
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Exercise 6 Page 394

Adjacent angles share a common vertex and one side.

∠ BAC and ∠ CAD, ∠ CAD and ∠ DAE, ∠ DAE and ∠ EAC, ∠ EAC and ∠ BAC

Practice makes perfect

Before we take a look at the given diagram, let's start by defining adjacent angles.

Adjacent Angles

Two angles that share a common vertex and side.

Now, let's consider the given diagram.

We have four pairs of adjacent angles: ∠ BAC and ∠ CAD && ∠ CADand ∠ DAE ∠ DAE and ∠ EAC && ∠ EACand ∠ BAC