Lesson 4.2

Report
4-2 Triangle
Congruence by SSS
and SAS
Notes
• SSS- side, side, side.
• SAS- side, angle, side (MUST BE IN ORDER!!)
• We will use these new theorems to prove
triangles are congruent without needing to show
all sides, and all angles are congruent.
Theorem
Example 1
Plan: To prove
the triangles
are congruent
by SSS, the
three pairs of
sides need to
be congruent
Theorem
What does that mean!?!
Example 2
Example 3
• Discuss with someone what you think you need
to do to solve this
Example 4
Practice!
• Pg 189-190 #1-5, 7-11, 14-21, 22-27

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