Question

which angles are complementary to each other? ∠2 and ∠1 ∠3 and ∠1 ∠1 and ∠5 ∠3 and ∠5

Explanation:

Step1: Recall complementary angles definition

Complementary angles add up to 90 degrees.

Step2: Analyze the given angles

From the figure, we see that $\angle1$ is a right - angle (marked with a square symbol). If two angles add up to $\angle1$ (90 degrees), they are complementary. $\angle3$ and $\angle5$ together form a right - angle with $\angle1$ as the vertical angles and angle relationships at the intersection of lines.

Answer:

$\angle3$ and $\angle5$