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Because you need information about all three parts of the triangle, either the side or the angle opposite it, for each of the sides of a triangle.

In AA you are missing the third angle, you could have a triangle where both angles were the same but the height could be different giving you a taller or shorter triangle.

In SSA, the angle would be the one opposite the first side, so you have no information about the third side

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Q: Why AA and SSA are no valid methods to prove triangles congruent?
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