NEVER use SSA to prove triangles are congruent!

CPCTC Corresponding Parts of Congruent Triangles are Congruent

SSS Also, make flashcards for: SAS, ASA, AAS, and HL

Lesson 4-4 I can use triangle congruence postulates to prove that triangles are congruent

Given TS ≅ TS ∆RST ≅ ∆UTS Reflexive SSS

Given US ≅ US ∆RSU ≅ ∆TSU Reflexive SAS ∠RSU ≅ ∠TSU Def’n of angle bisector

Given ∠ABD ≅ ∠CBD ∆ABD ≅ ∆CBD ASA Your turn!

Given BD ≅ BD ∆ABD ≅ ∆CBD Reflexive SSS ∠A ≅ ∠C CPCTC

Given DF ≅ DF ∆EDF ≅ ∆GFD Reflexive AAS CPCTC ∠EDF ≅ ∠GFD DG ≅ FE AIA

Given CB ≅ CB Reflexive ∆ABC ≅ ∆DBC HL ∠A ≅ ∠D CPCTC

∠ADB ≅ ∠CBD BD ≅ BD ∆ABD ≅ ∆CDB Given || lines ↔ AIA ≅ Reflexive SAS

∠DEG ≅ ∠FEG GE ≅ GE ∆DEG ≅ ∆FEG DE ≅ FE Given Def’n of angle bisector Reflexive ASA CPCTC

Mickey Mouse 4-4 and 4-5 I got it! I mostly get it I need more help I don’t get it at all!

#1 I can recognize SSS, SAS, ASA, AAS and HL postulates #2 I can use triangle congruence postulates to prove that triangles are congruent #1 #2

ASSIGNMENT: 4-4 worksheet