Reflexive Property of Congruence: figure A figure A Symmetric Property of Congruence: If , then . If figure A figure B, then figure B figure A. Transitive Property of Congruence If and , then . If figure A figure B and figure B figure C, then figure A figure C. Chapter 2 Properties, Postulates and Theorems Geometric Reasoning Theorem What it says… Key Words Picture Name Two angles Linear Pair If two angles form a linear pair, then Theorem Linear pair they are supplementary. 2-6-1 Supplementary Two angles If two angles are supplementary to Congruent the same angle (or to two congruent Supplements Supplementary angles), then the two angles are Theorem congruent. Congruent 2-6-2 Right Angle Right angle Congruence All right angles are congruent. Theorem Congruent 2-6-3
Reflexive Property of Congruence: figure A figure A Symmetric Property of Congruence: If figure A figure B, then figure B figure A. If , then . Transitive Property of Congruence If figure A figure B and figure B figure C, then figure A figure C. If and , then . Chapter 2 Properties, Postulates and Theorems Geometric Reasoning Theorem Name What it says… Key Words Picture Linear Pair Theorem 2-6-1 If two angles form a linear pair, then they are supplementary. Two angles Linear pair Supplementary Congruent Supplements Theorem 2-6-2 If two angles are supplementary to the same angle (or to two congruent angles), then the two angles are congruent. Two angles Supplementary Congruent Right Angle Congruence Theorem 2-6-3 All right angles are congruent. Right angle Congruent
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