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Transcript
Section 4-2 Some Ways to Prove Triangles Congruent POSTLATES: 1. SSS Postulate (Side-Side-Side) If three sides of one triangle are congruent to three sides of another triangle, then the triangles are congruent. Example: C D F A B E By SSS Postulate, ABC DEF 2. SAS Postulate (Side-Angle-Side) If two sides and the included angle of one triangle are congruent to two sides and the included angle of another triangle, then the triangles are congruent. Example: B A D C By SAS Postulate, ABD CDB 3.ASA Postulate (Angle-Side-Angle) If two angles and the included side of one triangle are congruent to two angles and the included side of another triangle, then the triangles are congruent. Example: D B C E A By ASA Postulate, ABC DEC
