Download congruent

Test Review
Talk with your partners about your tests.
Bell-Ringer
What are congruent figures?
Give me 2 examples around the
classroom.
Chapter 4
Congruent Triangles
Section 4-1 Congruent Figures
Review:
 What
makes angles

?
same degree measurement
 What
makes segments
same length

?
Can an angle be congruent to
a segment?
No…Why not?
Can a triangle be congruent to
a square?
No…Why not?
What makes figures congruent?
Congruent Figures
Two figures that have the
same size and shape.
If figures are congruent then
they have congruent angles
and congruent sides or parts.
Labeling Congruent Figures
Congruent figures
must be labeled
according to their
corresponding parts.
Label the following congruent figures.
Possible Answers
Δ1  Δ2
Δ ABC  Δ EFD
Δ BCA  Δ FDE
Δ CBA  Δ DFE
Δ2
Δ EFD
Δ FDE
Δ DEF
Δ1
Δ ABC
Δ BCA
Δ CAB
 Δ3
 Δ HGI
 Δ GHI
 Δ IHG
 Δ3
 Δ HGI
 Δ GIH
 Δ IHG
Given: Δ CAT  Δ DOG
Which angles are congruent to one another?
C
and D
 A and O
 T and G
Which sides are congruent to one another?
 CA
and DO; AC and OD
 AT and OG; TA and GO
 TC and GD; CT and DG
To help solving draw a picture!
Applications to Proofs
When the definition of congruent
triangles is used in a proof we write,
Corr. parts of  Δ are 
or CPCTC !!!
Current Goal:Identify/label
CPCTC.
Future Goal: Use  parts
to prove that figures are 
and vice versa.
All Together: Classroom Ex.
pg 119 #1-20
AND
Mixed Review # 1 & 2 page 121
HOMEWORK
Pg120 #1-23 ODD
Bring in 3 different color markers to
write with!