Congruence of Triangles

1
Congruence of Triangles

• Lesson Three
• Unit Four
• Standards G 1, 3.8, 3.9
• Sections 4 3 through 4 - 5

2
Bell Work
Go over Quiz
3
Reading

• Read Pg. 196 198.
• Look for bold words, examples, theorems, and
  definitions.

4
CPCTC

• Two triangles are congruent if and only if their
  corresponding parts are congruent.
• This means that all three angles have to be
  congruent and all three sides have to be
  congruent.

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Corresponding Parts
B
D
F
AB DE BC EF AC DF ltA ltD ltB ltE ltC ltF
C
E
A
6
Example 1 Pg. 197

• A design for a quilt has been drawn on graph
  paper. Identify the triangles that appear to be
  congruent.

7
Example 2 Pg. 198

• The bridge in the picture uses a simple
  triangular truss design. The vertices of two
  triangles are labeled and ?TRU ?TSU. Name the
  corresponding congruent angles and sides.

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Lets try some together

• Pg. 199 200 1 14

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Homework

• Pg. 200 15 21
• Pg. 201 24 36