Why are AAA , AAS and SSA not valid as rules of congruency?

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Solution

However, knowing only Side-Side-Angle (SSA) does not work because the unknown side could be located in two different places.

Knowing only Angle-Angle-Angle (AAA) does not work because it can produce similar but not congruent triangles.

Knowing only Angle-Angle-side cannot use as congruent rule

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