Triangles DEF and

Given: Triangles DEF and LMN are both isosceles

DE = DF and LM = LN, respectively.

If DE = LM and EF = MN

DE = DF and LM = LN

If DE = LM

Then putting value on both sides

We get

DF = LN

In Δ DEF and Δ LMN

DE = LM

DF = LN

EF = MN

Hence Δ DEF Δ LMN

Both triangles are congruent by SSS criterion

As both triangles are congruent

E = M

M = 40°

As LMN is isosceles triangle having base angles are equal

M = N

N = 40°

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