Yes, AAA Theorem is a valid theorem for congruency when used along with two more theorems to prove congruency of triangles.
AAA (Angle-Angle-Angle) Theorem states two corresponding angles of a triangle are equal to that of the second triangle if and only if the two corresponding sides containing the angles are proportional. Then the triangles are similar.
The AAA Theorem is valid for congruency of triangles if it follows the above given conditions along with the fact that two more theorems such as SSS or AAS.
As congruency in triangles is the condition in which both the given triangles are proven to be of the same shape and size.
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