Which diagram shows a pair of angle measure that proves lines $c$ and $d$ are parallel?
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a

Answer

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Answer

$\boxed{\text{Diagram a}}$ shows a pair of angle measures that prove lines c and d are parallel.

Steps

Step 1 ：Check for corresponding angles, alternate interior angles, and alternate exterior angles in each diagram.

Step 2 ：Diagram a has congruent corresponding angles and alternate interior angles, which indicates that lines c and d are parallel in this diagram.

Step 3 ：$\boxed{\text{Diagram a}}$ shows a pair of angle measures that prove lines c and d are parallel.