1. Over Lesson 2–6 5-Minute Check 1 A.Distributive Property B.Addition Property C.Substitution Property D.Multiplication Property State the property that justifies the statement. 2(LM + NO) = 2LM + 2NO

2. Over Lesson 2–6 5-Minute Check 2 A.Distributive Property B.Substitution Property C.Addition Property D.Transitive Property State the property that justifies the statement. If m  R = m  S, then m  R + m  T = m  S + m  T.

3. Over Lesson 2–6 5-Minute Check 3 A.Multiplication Property B.Division Property C.Distributive Property D.Substitution Property State the property that justifies the statement. If 2PQ = OQ, then PQ =

4. Over Lesson 2–6 5-Minute Check 4 A.Reflexive Property B.Symmetric Property C.Transitive Property D.Substitution Property State the property that justifies the statement. m  Z = m  Z

5. Over Lesson 2–6 5-Minute Check 5 A.Reflexive Property B.Symmetric Property C.Substitution Property D.Transitive Property State the property that justifies the statement. If BC = CD and CD = EF, then BC = EF.

6. Over Lesson 2–6 5-Minute Check 6 A.x = x B.If x = 3, then x + 4 = 7. C.If x = 3, then 3 = x. D.If x = 3 and x = y, then y = 3. Which statement shows an example of the Symmetric Property?

7. Then/Now You wrote algebraic and two-column proofs. Write proofs involving segment addition. Write proofs involving segment congruence.

8. Concept

10. Example 1 Use the Segment Addition Postulate 2. 3. 4. StatementsReasons 1.

11. Example 1 6. 7. Proof: StatementsReasons 5. Use the Segment Addition Postulate 8.

12. Example 1 Prove the following. Given:AC = AB AB = BX CY = XD Prove:AY = BD

13. Example 1 1. Given AC = AB, AB = BX 1. 2. Transitive Property AC = BX 2. 3. Given CY = XD 3. 4. Addition PropertyAC + CY = BX + XD4. AY = BD 6. Substitution6. Proof: StatementsReasons Which reason correctly completes the proof? 5. ________________ AC + CY = AY; BX + XD = BD 5. ?

14. Example 1 A.Addition Property B.Substitution C.Definition of congruent segments D.Segment Addition Postulate

15. Concept

16. Over Lesson 2–6 Assignment: 148/ 1-10,23-36 160/ 1-13,18-20,24-43