TechMathI - 4.2 - Proving Triangles Congruent

(when possible) Bell Ringer Name That Postulate

Angle – Side – Angle Postulate ,[object Object]

Angle-Side- Angle (ASA) ,[object Object],[object Object],[object Object], ABC   DEF B A C E D F included side

The side between two angles Included Side GI HI GH

Name the included side:  Y and  E  E and  S  S and  Y Included Side YE ES SY S Y E

Angle – Angle – Side Postulate ,[object Object]

Angle-Angle-Side (AAS) ,[object Object],[object Object],[object Object], ABC   DEF B A C E D F Non-included side

Warning: No SSA Postulate A C B D E F NOT CONGRUENT There is no such thing as an SSA postulate!

Warning: No AAA Postulate A C B D E F There is no such thing as an AAA postulate! NOT CONGRUENT

Name That Postulate SAS ASA SSS SSA (when possible)

Let’s Practice Indicate the additional information needed to enable us to apply the specified congruence postulate. For ASA: For SAS:  B   D For AAS:  A   F AC  FE

You try! Indicate the additional information needed to enable us to apply the specified congruence postulate. For ASA: For SAS: For AAS:

TechMathI - 4.2 - Proving Triangles Congruent

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TechMathI - 4.2 - Proving Triangles Congruent