4.1 Congruent Figures
What is the difference between congruent and similar triangles?
• Write a definition for each in your own words
• Draw and example of each
Objective: To recognize congruent figures and their corresponding parts
Congruent figures have exactly the same size and shape.
When two figures are congruent you can move one so that it fits exactly on the other one.
Congruent polygons have congruent corresponding parts
To name congruent polygons list them in order of their congruent parts. ABCD ≅ YZWX
List the congruent corresponding parts
ABCD ≅ YZWX
A
Y
B
Sides:
Z
Angles:
A
D
C
X
Y
B
Z
W
D
No ­ they are not congruent. There's not enough information.
C
X
W
Homework
Statements
Reasons
page: 200
#'s: 3 ­ 13, 24 ­ 28, 38 ­ 40