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SSS postulate
If three sides of one triangle are congruent to three sides of a second triangle, then the triangles are congruent.
SAS postulate
If two sides and the included angle of one triangle are congruent to two sides and the included angle of a second triangle, then the triangles are congruent.
ASA postulate
If two angles and the included side of one triangle are congruent to two angles and the included side of another triangle, then the triangles are congruent.
AAS theorem
If two angles and the nonincluded side of one triangle are congruent to the corresponding two angles and side of a second triangle, then the two triangles are congruent.
CPCTC
(corresponding parts of congruent triangles are congruent)
Included side
side located between two consecutive angles of a polygon.
Included angle
The angle formed by two adjacent sides of a polygon