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# 4.2 apply congruence and triangles

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

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• ### 4.2 apply congruence and triangles

1. 1. 4.2 Apply Congruence and Triangles Mr. Saucedo Geometry Milby High School
2. 2. OBJECTIVE… • We will identify congruent figures.
3. 3. VOCABULARY • CONGRUENT FIGURES • CORRESPONDING PARTS
4. 4. CONGRUENT FIGURES • DEFINITION: ▫ Figures with the same size and shape. • SYMBOL: • VISUAL
5. 5. Checkpoint: Are the following shapes congruent?
6. 6. CHECKPOINT: Are the following figures congruent?
7. 7. CHECKPOINT: Are the following figures congruent?
8. 8. TALKING ABOUT MATHEMATICS… • Turn to your neighbor and tell him what makes figures congruent.
9. 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. 10. ACTIVITY: CORRESPONDING PARTS
11. 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. 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. 13. CHECKPOINT: • Are the two triangles congruent?
14. 14. GUIDED PROBLEM 1 • Identify congruent parts. • Are these triangles
15. 15. GUIDED PROBLEM 2
16. 16. CHECKPOINT
17. 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. 18. HOMEWORK: Section 4-2 Workboko page 64 Problems: 2, 3, 4, 5, 6, 7, 11 & 12 Pre AP : Add problems 13, 14 & 15.