Question

notes: proving triangles congruent
name and mark all of the corresponding parts. △abc ≅ △def
when trying to prove if a triangle is congruent, we do not need all six of the corresponding parts.

Explanation:

Step1: Identify corresponding angles

For congruent triangles $\triangle ABC\cong\triangle DEF$, vertices in the same - order are corresponding. So $\angle A$ corresponds to $\angle D$, $\angle B$ to $\angle E$, $\angle C$ to $\angle F$.

Step2: Identify corresponding sides

Sides between corresponding vertices are corresponding. So side $AB$ corresponds to $DE$, $BC$ to $EF$, and $AC$ to $DF$.

Answer:

Corresponding angles: $\angle A=\angle D$, $\angle B=\angle E$, $\angle C=\angle F$. Corresponding sides: $AB = DE$, $BC=EF$, $AC = DF$.