4.3 TRIANGLE
CONGRUENCE BY ASA
AND AAS
•  TO PROVE TRIANGLE CONGRUENCE
BY ASA POSTULATE AND AAS
THEOREM
Can Angle Angle Side Work?
•  What About if the side is not Included between the two
angles?
•  Can you still prove the Triangles Congruent?
•  Remember…
So…
If in a Triangle, there is two pairs of corresponding
congruent angles …
then I know the third pair of angles must be congruent also.
So AAS can work because I know its only ASA in disguise!
Alt Interior Angles
ASA Postulate
Closure
• Why are the letters of ASA and AAS
written in a different order?
•  ASA has the side included between the
pairs of angels, AAS the side is not
included.