△ DEF and △ LMN are both isosceles with DE = DF and LM = LN, respectively. If DE = LM and EF = MN, then are the two triangles congruent? Which condition do you use? If ∠F=40∘, what is the measures ∠N?

△ DEF and △ LMN are both isosceles with DE = DF and LM = LN, respe

1.	△ DEF and △ LMN are both isosceles with DE = DF and LM = LN, respectively. If DE = LM and EF = MN, then are the two triangles congruent? Which condition do you use? If ∠F=40∘, what is the measures ∠N?
Answer» $△$ DEF and $△$ LMN are both isosceles with DE = DF and LM = LN, respectively. If DE = LM and EF = MN, then are the two triangles congruent? Which condition do you use? If $∠ F = 40^{\circ}$ , what is the measures $∠ N$ ?