# Today�s Lesson: Congruent & Similar by 62I0JCj

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```									Congruent
&
Similar
What are we going to learn
today?

• How to identify congruent
figures.

• How to identify similar figures.
Congruent

•Congruent means to
have the same size
and same shape.
• If two figures are congruent they are identical.
Congruent
• You will be able to lay the
figures on top of each other and
they should match perfectly.
• The two triangles are congruent.
• They have the same size and
shape.
Real-Life Congruence
You walk into the mall and see dozens of
copies of your favorite CD on sale. All of
the CDs are exactly the same size and
shape.The CDs are congruent. In fact, you
can probably think of many objects that are
mass produced to be exactly the same size
and shape.
Congruent Figures
• Two figures are the
congruent if they have the
same size and same
shape.
Congruent Line Segments
•Two line segments are
congruent if they
have the same length.
• Which line segments are congruent?

K               L

N              M
Congruent Angles
• Two angles are
congruent if they have
the same measure.
• Look at the parallelogram below.
• Which angles are congruent?
W                X

Z                Y
Similar Figures

• Similar Figures have the
same shape but do not
have the same size.
Similar Figures
• Triangles 1 and 3 are similar triangles.
• They are the same shape but not the same
size.
• Triangles 2 is not similar because it is not
the same shape.

1               2              3
Corresponding Parts
•Corresponding Parts:
matching parts of
congruent or similar
figures
Corresponding Parts
Triangle CAT is similar to triangle
DOG.
The corresponding angles, such as C
C         & D are congruent.

D

A             T         O          G
Congruent figures
are always similar.