Which answer is not a theorem or postulate used to prove triangles similarity?

SAS
SSA ~~my choice
SSS
AA

true

To determine which answer choice is not a theorem or postulate used to prove triangle similarity, you need to have an understanding of the theorems and postulates related to triangle similarity.

1. SAS (Side-Angle-Side) Theorem: This states that if two sides of a triangle are proportional to two sides of another triangle, and the included angles are congruent, then the triangles are similar.

2. SSA (Side-Side-Angle) Postulate: This is not a theorem but a postulate, and it states that if two sides of a triangle are proportional to two sides of another triangle, and the included angle is not congruent, then the triangles may or may not be similar.

3. SSS (Side-Side-Side) Theorem: This states that if the corresponding sides of two triangles are proportional, then the triangles are similar.

4. AA (Angle-Angle) Theorem: This states that if two angles of one triangle are congruent to two angles of another triangle, then the triangles are similar.

Based on the explanations above, the answer that is not a theorem or postulate used to prove triangle similarity is SSA.