We are asked which postulate or theorem we could use to prove △ABC≅△DEF.
It is given that ∠A≅∠D,AC≅DF, and ∠C≅∠F. Therefore, two angles and the included side of △ABC are congruent to two angles and the included side of △DEF. Therefore, we can conclude that △ABC≅△DEF by the .
⎩⎪⎪⎨⎪⎪⎧∠A≅∠DAC≅DF∠C≅∠F⇒△ABC≅△DEF by ASA