Question

(b)
select
△abc≅△□ by the
congruent:
not necessarily congruent

Explanation:

Step1: Analyze the given triangles

In \(\triangle ABC\) and \(\triangle DEF\), we have \(\angle A=\angle F\), \(\angle C = \angle D\), and \(AB=FE\).

Step2: Apply the AAS (Angle - Angle - Side) congruence criterion

The AAS congruence criterion states that if two angles and a non - included side of one triangle are equal to two angles and the corresponding non - included side of another triangle, then the two triangles are congruent.

Answer:

\(\triangle ABC\cong\triangle FED\) by the \(AAS\) (Angle - Angle - Side) congruence criterion.