In ∆ABC and ∆DEF, you know that ∠A ≅ ∠D, ∠C ≅ ∠F, and . Before concluding that the triangl...

In ∆ABC and ∆DEF, you know that ∠A ≅ ∠D, ∠C ≅ ∠F, and . Before concluding that the triangles are congruent by ASA, you need to show that ∠B ≅ ∠E. State the postulate or theorem that allows you to confirm this statement (∠B ≅ ∠E).