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4-2
Triangle Congruence by
SSS and SAS
Side-Side-Side (SSS) Postulate
If the three sides of one triangle are congruent
to the three sides of another triangle, then the
two triangles are congruent
Problem 1: Using SSS
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• You can show relationships between a
pair of corresponding sides and an
included angle
• Included refers to the angles and the
sides of a triangle as shown
Side-Angle-Side (SAS) Postulate
If two sides and the included angle of one triangle are
congruent to two sides and the included angle of
another triangle, then the two triangles are congruent
Problem 2: Using SAS
Problem 3: Identifying Congruent
Triangles
Would you use SSS or SAS to prove the triangles
congruent? If there is not enough information to
prove the triangles congruent by SSS or SAS, write not
enough information. Explain you answer.
Would you use SSS or SAS to prove the triangles
congruent? If there is not enough information to
prove the triangles congruent by SSS or SAS, write not
enough information. Explain you answer.
Would you use SSS or SAS to prove the triangles
congruent? If there is not enough information to
prove the triangles congruent by SSS or SAS, write not
enough information. Explain you answer.
Would you use SSS or SAS to prove the triangles
congruent? If there is not enough information to
prove the triangles congruent by SSS or SAS, write not
enough information. Explain you answer.