Once you prove that a diagram is congruent then you can say that all the parts are congruent.
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You can only use CPCTC after you prove the 2 triangles congruent.
CPCTC represents Corresponding Parts of Congruent Triangles are Congruent. You would use this in Triangle Proofs.
If lmn xyz which congruences are true by cpctc: ml=yx ln=yz y=m
You can prove that to triangles are congruent with SSS, then use CPCTC to prove that two corresponding angles of those triangles are congruent.
Before using Corresponding Parts of a Congruent Triangle are Congruent theorem (CPCTC) in a geometric proof, you must first prove that there is a congruent triangles. This method can be used for proving polygons and geometrical triangles.