# 4-6 - Congruence 4-6 Triangle Congruence:CPCTC CPCTC...

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Holt Geometry 4-6 Triangle Congruence: CPCTC 4-6 Triangle Congruence: CPCTC Holt Geometry Warm Up Warm Up Lesson Presentation Lesson Presentation Lesson Quiz Lesson Quiz

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Holt Geometry 4-6 Triangle Congruence: CPCTC Warm Up 1. If ∆ ABC DEF , then  A ? and BC ? . 2. What is the distance between (3, 4) and (–1, 5)? 3. If 1 2, why is a||b ? 4. List methods used to prove two triangles congruent. D EF 17 Converse of Alternate Interior Angles Theorem SSS, SAS, ASA, AAS, HL
Holt Geometry 4-6 Triangle Congruence: CPCTC Use CPCTC to prove parts of triangles are congruent. Objective

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Holt Geometry 4-6 Triangle Congruence: CPCTC CPCTC Vocabulary
Holt Geometry 4-6 Triangle Congruence: CPCTC CPCTC is an abbreviation for the phrase “Corresponding Parts of Congruent Triangles are Congruent.” It can be used as a justification in a proof after you have proven two triangles congruent.

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Holt Geometry 4-6 Triangle Congruence: CPCTC SSS, SAS, ASA, AAS, and HL use corresponding parts to prove triangles congruent. CPCTC uses congruent triangles to prove corresponding parts congruent. Remember!
Holt Geometry 4-6 Triangle Congruence: CPCTC Example 1: Engineering Application A and B are on the edges of a ravine. What is AB? One angle pair is congruent, because they are vertical angles. Two pairs of sides are congruent, because their lengths are equal.

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