Question

complementary and supplementary angles
instruction active
using the congruent complements theorem
∠4 and ∠5 are complements, and ∠1 and ∠5 are complements.
by the congruent complements theorem, which angle is congruent to ∠4?
○ ∠1
○ ∠2
○ ∠3
○ ∠5

Explanation:

The Congruent Complements Theorem states that if two angles are complementary to the same angle, then those two angles are congruent. Here, ∠4 and ∠1 are both complementary to ∠5, so ∠4 ≅ ∠1.

Answer:

∠1