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AAS (Angle-Angle-Side) Postulate

If two angles and a non-included side of a triangle are congruent to two angles and the corresponding non-included side of another triangle, then the two triangles are congruent .

In the figure, $\angle B\cong \angle E,\angle C\cong \angle F\text{ and }\overline{AC}\cong \overline{DF}$ .

Therefore, by the AAS postulate, $\Delta ABC\cong \Delta DEF$ .