Question

lesson 2 - 3: do now
if ∠1≅∠2, which lines are parallel?
□ because ∠1 and ∠2 are □

Explanation:

Step1: Recall parallel - line postulate

If corresponding angles are congruent, then the lines are parallel. Here, $\angle1$ and $\angle2$ are corresponding angles.

Step2: Determine parallel lines

Since $\angle1\cong\angle2$, by the corresponding - angles postulate, lines $m$ and $p$ are parallel.

Answer:

Lines $m$ and $p$ are parallel because $\angle1$ and $\angle2$ are corresponding angles.