∆ABC ≅ ∆FED means that ∆ABC covers completely and vertices of ∆ABC will be on he vertices of ∆FED.
∴ A ↔ F, B ↔ E and C ↔ D
Corresponding sides will be congruent.
\(\overline {AB}\) ↔ \(\overline {FE}\) , \(\overline {BC}\) ↔ \(\overline {ED}\) and \(\overline {CA}\) ↔ \(\overline {DF}\)
Corresponding angles will be congruent.
∠A ↔ ∠F, ∠B ↔ ∠E and ∠C ↔ ∠D