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In geometry, â€˜Corresponding parts of congruent triangles are
congruentâ€™ (CPCTC) is a succinct statement of a theorem regarding congruent triangles,
defined as triangles either of which is an isometry of the other. CPCTC states
that if two or more triangles are congruent than all of their corresponding angles
and sides are congruent as well. CPCTC is useful in proving theorems about
triangles and other polygons.

If
triangles PRQ and STU are congruent, denoted as:

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