The line r is the transversal and ∠1 and ∠2 are linear pairs.
Angles formed when a transversal cuts parallel lines
When a transversal cuts parallel lines , angles formed includes corresponding angles, alternates angles, linear pair angles etc.
Therefore, p and q are the parallel lines.
The transversal is r.
The transversal r, cuts the parallel lines p and q.
Therefore, line r is the transversal and ∠1 and ∠2 are linear pairs.
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