∠3 ≅ ∠4
a. Congruent Supplements Theorem
b. Congruent Complements Theorem
c. Vertical angles are congruent
d. None of the above
C. Vertical angles are congruent
a. Congruent Supplements Theorem
b. Congruent Complements Theorem
c. Vertical angles are congruent
C. Vertical angles are congruent