SOLUTION: Given two triangles ABC and DEF, where AB≅AC, DE≅DF, and ∠A≅∠D. Show that ∠B≅∠E. Please reply ASAP.

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Question 1033810: Given two triangles ABC and DEF, where AB≅AC, DE≅DF, and ∠A≅∠D. Show that ∠B≅∠E.
Please reply ASAP.

Answer by ikleyn(52803)   (Show Source): You can put this solution on YOUR website!
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Given two triangles ABC and DEF, where AB≅AC, DE≅DF, and ∠A≅∠D. Show that ∠B≅∠E.
Please reply ASAP.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

You are given two isosceles triangles ABC an DEF with congruent angles A and D between the lateral sides.

Let mA, mB, mC, mD, mE and mF  be the measures of the corresponding angles.

In an isosceles triangles the angles at the base are congruent:
∠B = ∠C   and   ∠E = ∠F.

It implies that

mB = mC =   and  mE = mF = .

Since mA = mD, you have mB = mC = mE = mF, QED.


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