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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, B E , C F  and  A C ¯ D F ¯ .

Therefore, by the AAS postulate, Δ A B C Δ D E F .