vertical angles are the angles that form opposite to each other in an "X" shape.
Linear pair are angles that fall on the same line and add up to 180 degrees.
Congruent angles are angles that are same in measure.
Now, we got to identify 1 pair of each type of angle from the following figure.
Angle 3 and 4 are linear pair (same line add up to 180, side by side).
Angle 1 and 4 are vertical angles (equal angles formed opposite, in X)
Angle 7 and 6 are congruent (also vertical ).