Final answer:
The SSA congruence theorem states that if two sides and the non-included angle of one triangle are congruent to two sides and the non-included angle of another triangle, then the two triangles are congruent.
Step-by-step explanation:
The SSA (side-side-angle) congruence theorem states that if two sides and the non-included angle of one triangle are congruent to two sides and the non-included angle of another triangle, then the two triangles are congruent.
For example, if triangle ABC is congruent to triangle DEF with side AB congruent to side DE, side AC congruent to side DF, and angle A congruent to angle D, then the triangles are congruent.
This theorem helps us determine when two triangles are congruent based on the given information about their sides and angles.