2. 5.2 Proving Triangles are Congruent by SSS and SAS
Remember: CONGRUENCE means that two figures (triangles, side lengths, or angle measures) are exactly the same SIZE and exactly the same SHAPE.

3. Side-Side-Side Congruence Postulate
If three sides of one triangle are congruent to three sides of a second triangle, then the two triangles are congruent.

4. Example 1
Does the diagram give enough information to show that the triangles are congruent? Explain.

5. Side-Angle-Side Congruence Postulate (SAS)
If two sides and the included angle of one triangle are congruent to two sides and the included angle of a second triangle, then the two triangles are congruent.

6. Example 2 (a)
Does the diagram give enough information to use the SAS Congruence Postulate? Explain your reasoning.

7. Example 2 (b)
Does the diagram give enough information to use the SAS Congruence Postulate? Explain your reasoning.

8. PROOF
Convincing argument that shows why a statement is true.

10. Example 3: Write a Proof

11. Example 4