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4-2 Triangle Congruence by
SSS & SAS
Objective: To Determine whether
triangles are congruent using SSS and
SAS postulate
What can you conclude from each
diagram
Discovery Time!
Quickly & Quietly Get into groups of 3
•Person 1: Make a triangle with lengths
2, 3, 4 in.
•Person 2: Make a triangle with lengths
3, 4, 5 in.
•Group: Walk around and observe same
triangles made by other groups
•Person 3: Record what observations
your group have made
SSS postulate
If 3 Corresponding Sides are
congruent, then the triangles are
congruent.
Ex 1:
SAS Postulate:
If two corresponding sides and the
included angle are congruent then the
triangles are congruent.
Ex 2:
From the info give, can you prove
Explain.
Ex 3:
Ex 4:
Ex 5:
Homework
Pg 189-190
2-30 evens
Omit 6,