TODAY IN GEOMETRY…  Review: Finding congruent angles and sides and proving triangles are congruent.  Learning Goal: 4.6 Use CPCTC to prove congruent.

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Presentation transcript:

TODAY IN GEOMETRY…  Review: Finding congruent angles and sides and proving triangles are congruent.  Learning Goal: 4.6 Use CPCTC to prove congruent parts of a triangle  Independent practice  AT – Proof-A-Rama 1 corrections

PRACTICE: Find all 6 corresponding parts

PRACTICE: Which postulate would you use to state that the triangles are congruent. Then tell which triangles are congruent. ORDER MATTERS: When writing congruent triangles, make sure all angles and sides correspond!

CPCTC: Corresponding parts of congruent triangles are congruent.

Using CPCTC in proofs: We use CPCTC to prove that parts of a triangle are congruent. We MUST PROVE TRIANGLES ARE CONGRUENT FIRST!

1.USE one postulate to prove triangles are congruent. 2.What other information do I need? 3.What are the congruent triangles? 4.Use CPCTC

STATEMENT REASON 1. Given 2. Reflexive Property 3. AAS 4. CPCTC *we’re proving congruent sides!!!!-use CPCTC

STATEMENT REASON 1. Given 2. Definition of bisector 4. SAS 5. CPCTC 3. Reflexive Property *we’re proving congruent sides!!!!-use CPCTC

HOMEWORK #7: Pg. 259: 3-8, 10, 11, 21 If finished, work on other assignments: HW #1: 221: 1-26, 32, HW #2: Pg. 228: 3-10, 15-16, Pg. 231: HW #3: Pg. 236: 5, 7, 9-12, 24, 26 (Graph paper needed) HW #4: Pg. 243: 3-15, 20-22, 25-27, HW #5: Pg. 252: 3-5, 8-13, 18-20, 33, 34, HW #6: Proof-A-Rama 1