Question

the error in identifying pairs of angles in the figure. ∠1 and ∠3 form a linear pair. ∠1 and ∠3 are not a linear pair because they do not share a common. these two angles are actually angles.

Explanation:

A linear - pair of angles must share a common side and a common vertex and be adjacent. ∠1 and ∠3 do not share a common side. They are vertical angles as they are opposite each other when two lines intersect.

Answer:

side; vertical