Question

Triangles 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 ∠ E = 40°, what is the measure of ∠ N ?

I don’t understand how we can find LN. Everywhere it says that DF = LN but we don’t have any proof, please help.

Answer 1

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Answer 2

Answer:

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