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Which of the following can only be used after you prove triangles are congruent? Alternate Interior Angles Reflexive Substitution CPCTC

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Hello!

CPCTC is your answer. CPCTC stands for Congruent Parts of Congruent Triangles are Congruent--it builds on the fact that the triangles are congruent, therefore this must be proven before using CPCTC.

Hope this helps!
User Kusal Kithmal
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