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The first thing you prove about congruent triangles are triangles that have same side lines (SSS) is congruent. (some people DEFINE congruent that way).

You just need to show AAS is equivalent or implies SSS and you are done.

That's the first theorem I thought of, don't know if it works though, not a geometry major.

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12y ago
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9y ago

The ASA theorem and the fact that the three angles of any triangle sum to 2*pi radians (180 degrees).

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Q: Which theorem is used to prove the AAS triangle congruence postulate theorem?
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