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CPCTC is an acronym for corresponding parts of congruent triangles are congruent

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SSS Theorem: If three sides of one triangle are equal to three sides of another triangle, the triangles are congruent.
SAS Theorem: If two sides and the included angle of one triangle are equal to the corresponding sides and angle of another triangle, the triangles are congruent.
ASA Theorem: If two angles and the included side of one triangle are equal to the corresponding angles and side of another triangle, the triangles are congruent.
AAS Theorem: If two angles and the non-included side of one triangle are equal to the corresponding angles and side of another triangle, the triangles are congruent.
HL Theorem: If the hypotenuse and one leg of one right-angled triangle are equal to the corresponding hypotenuse and leg of another right-angled triangle, the two triangles are congruent.