# Corresponding parts of congruent triangles are congruent

From Wixpert

**Corresponding parts of congruent triangles are congruent** (**CPCTC**) is a geometry theorem that says if two triangles are congruent, then each piece of those triangles is also congruent. CPCTC is often used as a step in geometry proofs to prove that two segments or angles are congruent.

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