Question

which angles are complementary to each other? ∠3 and ∠5 ∠4 and ∠5 ∠1 and ∠2 ∠3 and ∠1

Explanation:

Step1: Recall complementary - angles definition

Two angles are complementary if their sum is 90 degrees.

Step2: Analyze each option

We assume that the right - angle is formed by some of the angle combinations. In a right - angle, two non - overlapping angles that make up the right - angle are complementary. If we assume that $\angle3$ and $\angle5$ together form a right - angle (a 90 - degree angle), then by the definition of complementary angles, $\angle3+\angle5 = 90^{\circ}$, so $\angle3$ and $\angle5$ are complementary.

Answer:

$\angle3$ and $\angle5$