Congruent parts of congruent triangles are congruent (CPCTC)
https://www.kristakingmath.com/blog/cpctc-congruent-parts-of-congruent-triangles-are-congruent
WEBJun 3, 2021 · CPCTC stands for “corresponding parts of congruent triangles are congruent.” In some of the previous lessons on congruence, we used congruent parts of a pair of triangles to try to prove that the triangles themselves are congruent. CPCTC flips this around, and makes the point that, given two congrue.
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