9. The methods listed in the table, that can be used for proving two triangles congruent, require three parts of one triangle to be congruent to three corresponding parts of another triangle. Nakita thought she could summarize the results but she wanted to try one more experiment. She 5.2 Proving Triangles are Congruent: SSS and SAS 241 Goal Show triangles are congruent using SSS and SAS. Key Words • proof The Geo-Activity suggests the following postulate. 5.2 Proving Triangles are Congruent: SSS and SAS 2 Open your compass to measure AB&*of TABC . Use this length to construct DE&*so that it is congruent to AB&*.