2. All right angles are congruent BCD A TheoremGivenStatementReason If 2 angles are complements of the same angle, then they are congruent Complements of the same angle are congruent

3. TheoremGivenStatementReason If 2 angles are supplements of the same angle, then they are congruent Supplements of the same angle are congruent If 2 angles are congruent, their complements are congruent Complements of congruent angles are congruent

4. TheoremGivenStatementReason If two angles form a linear pair, they are supplementary Linear pairs are supplementary If 2 angles are congruent, their supplements are congruent Supplements of congruent angles are congruent BDA C

5. TheoremGivenStatementReason All straight angles are congruent Vertical angles are congruent E D C A B E DF B AC