The statement ∠A ≅ ∠D means that angle ∠A in one triangle is congruent to angle ∠D in another triangle. In the context of triangle congruence, it's important to note that corresponding angles are congruent.
So, if ΔABC ≅ ΔDEF
∠A ≅ ∠D (First angle of the first triangle is congruent to the first angle of the second triangle)
∠B ≅ ∠E (Second angle of the first triangle is congruent to the second angle of the second triangle)
∠C ≅ ∠F (Third angle of the first triangle is congruent to the third angle of the second triangle)
This is based on the angle-angle-angle (AAA) congruence criterion, which states that if the corresponding angles of two triangles are congruent, then the triangles are congruent.
Therefor ∠A ≅ ∠D means that angle ∠A in one triangle is congruent to angle ∠D in another triangle. In the context of triangle congruence, it's important to note that corresponding angles are congruent.