This document provides a lesson on congruent figures and corresponding parts of congruent triangles. It defines congruent figures as those with the same size and shape, and corresponding parts as pairs of sides or angles that have the same relative position in congruent or similar figures. Examples and activities are used to help students identify corresponding parts and determine if triangles are congruent by checking if their corresponding parts are equal. Students are given practice problems to further their understanding of congruence.

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.