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'corresponding parts of congruent triangles are congruent'
If you mean the symbol of a triangle, in math and science a triangle stands for change in
It refers to the two sides which, between them, make up the right angle.
a triangular pyramid
CPCTC is an acronym for the phrase 'corresponding parts of congruent triangles are congruent' It means that once we know that two triangles are congruent, we know that all corresponding sides and angles are congruent.