Answer:
∠1 ≅ ∠2 congruence
m∠1 = m∠2 property of equality
m∠2 + m∠3 = 180 definition of supplementary angles
m∠1 + m∠3 = 180 Vertical Angles Theorem
∠1 and ∠3 are supplementary angles.
Find the words that fit each one
Definition of Congruence
Substitution Subtraction
Property of Equality
Definition of Supplementary
Step-by-step explanation: