Question

select the transversal connecting ∠2 and ∠12. then classify the relationship between ∠2 and ∠12 as alternate interior, alternate exterior, corresponding, or consecutive interior angles.

Explanation:

Step1: Identify the transversal

A transversal is a line that intersects two or more other lines. By observing the figure, line $c$ intersects the lines that $\angle2$ and $\angle12$ are on. So the transversal is line $c$.

Step2: Classify the angle - relationship

$\angle2$ and $\angle12$ are on the outer - side of the two intersected lines and on the opposite sides of the transversal. According to the definitions of angle - relationships formed by a transversal, they are alternate exterior angles.

Answer:

Transversal: line $c$; Relationship: alternate exterior