Proving triangle congruence | Congruence | High school geometry | Khan Academy

Given a figure composed of 2 triangles, prove that the triangles are congruent or determine that there's not enough information to tell.

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[shivampunia]

When you told us to stop the video and solve the problem, i sat there for 15 minutes, thinking I'm stupid coz i couldn't find the third angle (cda=cba).
So, please give the full question.😂😂

[bejano]

We know that postulates do not require proof and that they are assumed to be true. But in order for a given sentence to be called a postulate, it must be proved that it cannot be derived from other independent postulates. How do we know, that AAS postulate is true. To say only, that it is a postulate is not sufficient. If someone can prove, that AAS postulate can not be proved with help of other independent postulates (axioms), it would be OK. Without such a proof one can not say, that "AAS postulate" is a real postulate.