A triangle has 6 parts ... 3 sides and 3 angles.
It's possible for two triangles to have as many as 3 of their parts congruent,
and the triangles still not be congruent.
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The SAS theorem is used to prove that two triangles are congruent. If the triangles have a side-angle-side that are congruent (it must be in that order), then the two triangles can be proved congruent. Using this theorem can in the future help prove corresponding parts are congruent among other things.
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.
Only if the congruent angle is the angle between the two congruent sides (SAS postulate).
'corresponding parts of congruent triangles are congruent'
When two triangles are congruent, there are 6 facts that are true about the triangles. The triangles have 3 sets of congruent (of equal length) sides and the triangles have 3 sets of congruent (of equal measure) angles.