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Lesson 4.2 in High School Geometry. Congruence in triangles and corresponding sides.

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- 1. 4.2 Apply Congruence and Triangles Mr. Saucedo Geometry Milby High School
- 2. OBJECTIVE… • We will identify congruent figures.
- 3. VOCABULARY • CONGRUENT FIGURES • CORRESPONDING PARTS
- 4. CONGRUENT FIGURES • DEFINITION: ▫ Figures with the same size and shape. • SYMBOL: • VISUAL
- 5. Checkpoint: Are the following shapes congruent?
- 6. CHECKPOINT: Are the following figures congruent?
- 7. CHECKPOINT: Are the following figures congruent?
- 8. TALKING ABOUT MATHEMATICS… • Turn to your neighbor and tell him what makes figures congruent.
- 9. CORRESPONDING PARTS • DEFINITION: ▫ A pair of sides or angles that have the same relative position in two congruent or similar figures. • VISUAL ▫ Angles A and E are corresponding. ▫ Angles C and F are corresponding. ▫ Side BC corresponds to DF, etc.
- 10. ACTIVITY: CORRESPONDING PARTS
- 11. ACTIVITY DEBRIEF QUESTIONS • How can patty paper help you to determine which sides and angles are corresponding? • How do you determine if an angle is included between two sides? • How do you determine if a side is included between two angles?
- 12. BIG QUESTION: • How can we decide if two Figures are congruent or not? • What steps could we take to make a mathematical decision?
- 13. CHECKPOINT: • Are the two triangles congruent?
- 14. GUIDED PROBLEM 1 • Identify congruent parts. • Are these triangles
- 15. GUIDED PROBLEM 2
- 16. CHECKPOINT
- 17. INDEPENDENT PRACTICE Section 4-2, page 228 Problems: 3, 5, 6, 7, 8, 9, 10, 12 (is it congruent?), 16, 20. Pre-AP: Do worksheet.
- 18. HOMEWORK: Section 4-2 Workboko page 64 Problems: 2, 3, 4, 5, 6, 7, 11 & 12 Pre AP : Add problems 13, 14 & 15.

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