Final answer:
The relationship between ∠1 and ∠2 is that they are complementary angles, forming a 90° angle between each other.
Step-by-step explanation:
The relationship between ∠1 and ∠2 can be described as complementary angles, forming a 90° angle between each other. Complementary angles are two angles whose sum is 90°. In this case, ∠1 and ∠2 are adjacent angles that together form a right angle. Therefore, they are complementary angles.