Final answer:
The pair of angles is perpendicular, forming a 90° angle.
Step-by-step explanation:
The pair of angles described in the question is (b) They are perpendicular, forming a 90° angle between each other.
Perpendicular angles are defined as two lines that intersect and form a right angle, which measures 90 degrees.
For example, if you take a ruler and place it perpendicular to a table, the angle formed between the ruler and the table would be 90 degrees.