never use ssa to prove triangles are congruent!. cpctc corresponding parts of congruent triangles...

NEVER use SSA to prove triangles are

congruent!

CPCTCCorresponding 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

Given TS ≅ TS∆RST ≅ ∆UTS Reflexive

SSS

Given

Given

US ≅ US∆RSU ≅ ∆TSU Reflexive SAS

∠RSU ≅ ∠TSU Def’n of angle bisector

Def’n of angle bisector

Given

Given

Given ∠ABD ≅ ∠CBD∆ABD ≅ ∆CBD ASA

Your turn!

Given

Given BD ≅ BD∆ABD ≅ ∆CBD Reflexive

SSS ∠A ≅ ∠C CPCTC

Given

Given DF ≅ DF∆EDF ≅ ∆GFD

Reflexive

AASCPCTC

∠EDF ≅ ∠GFD DG ≅ FE

AIA

Given

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

∠ADB ≅ ∠CBD BD ≅ BD∆ABD ≅ ∆CDB

Given

Given

|| lines ↔ AIA ≅ Reflexive

SAS

∠DEG ≅ ∠FEG GE ≅ GE∆DEG ≅ ∆FEG DE ≅ FE

Given

GivenDef’n of angle bisector

Reflexive

ASACPCTC

Mickey Mouse

4-4 and 4-5

I got it!

I mostly get it

I need more helpI 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

#1#2

ASSIGNMENT:4-4 worksheet