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