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Lesson 2-8

Lesson 2-8. Proof Review. Objectives. Write proofs. Vocabulary. No new vocabulary. Geometric Proof Worksheet. Given: 4x – 14 = 2x + 16 Prove: x = 15. Given: AD  BE Prove: AB  DE. A. B. C. D. E. Given: 2 is complimentary to 1  3 is complimentary to 4

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Lesson 2-8

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  1. Lesson 2-8 Proof Review

  2. Objectives • Write proofs

  3. Vocabulary • No new vocabulary

  4. Geometric Proof Worksheet Given: 4x – 14 = 2x + 16 Prove: x = 15

  5. Given: AD  BE Prove: AB  DE A B C D E

  6. Given: 2 is complimentary to 1 3 is complimentary to 4 2  4 Prove: 1  3 4 2 3 1

  7. Given: Two intersecting lines Prove: 1  3 2 1 3 4 (i.e., Prove the Vertical Angle Theorem!)

  8. Summary & Homework • Summary: • Proofs are a step-by-step deductive reasoning approach to problem solving using definitions, theorems, postulates and givens. • Homework: study for Quiz

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