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Unit 5 · Triangle Congruence and ProofProof-based

5.2SSS Congruence

Quick Answer

SSS (Side-Side-Side): if all three sides of one triangle are congruent to all three sides of another triangle, then the triangles are congruent.

Essential Question

How does the SSS Congruence Postulate allow us to prove two triangles congruent using only side lengths?

Learning Goals

  • 1State the SSS Congruence Postulate.
  • 2Identify SSS in a diagram using tick marks.
  • 3Write a two-column proof using SSS.
  • 4Apply SSS in coordinate geometry using the distance formula.

Key Vocabulary

SSS Congruence Postulate

If three sides of one triangle are congruent to three sides of another triangle, then the triangles are congruent.

Full lesson content coming soon

Worked examples, guided practice problems, a workbook, quiz, and downloadable PDF resources will be added to this lesson in Phase 2. The learning goals and vocabulary above reflect the complete lesson scope.