Answer: vertical angles
Explanation:
We know the pair of angles made on the opposite sides of intersection of two lines are known as Vertical Angles.
Also, Vertical angles are congruent.
in the given figure angle 1 and angle 2 are lying on the opposite side of the intersection of two lines.
Hence, the angles shown in the figure are vertical angles.
Hence, the relationship describes angles 1 and 2 = vertical angles