4.2 Apply Congruence and Triangles

Mr. Saucedo

GeometryMilby High School

OBJECTIVE…

• We will identify congruent

figures.

VOCABULARY

•CONGRUENT FIGURES

•CORRESPONDING PARTS

CONGRUENT FIGURES•DEFINITION:

▫Figures with the same size and shape.

•SYMBOL:

•VISUAL

Checkpoint: Are the following shapes congruent?

CHECKPOINT: Are the following figures

congruent?

CHECKPOINT: Are the following figures congruent?

TALKING ABOUT MATHEMATICS…•Turn to your neighbor and tell him what

makes figures congruent.

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.

ACTIVITY: CORRESPONDING PARTS

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?

BIG QUESTION:

• How can we decide if two Figures are congruent or not?

• What steps could we take to make a mathematical decision?

CHECKPOINT:

•Are the two triangles congruent?

GUIDED PROBLEM 1• Identify congruent

parts.

• Are these triangles congruent?

GUIDED PROBLEM 2

CHECKPOINT

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.

HOMEWORK:

Section 4-2

Workboko page 64

Problems: 2, 3, 4, 5, 6, 7, 11 & 12Pre AP : Add problems 13, 14 & 15.