Please help me solve the following question

Bro its very easy..
Firstly construct a line between D and E..now you are having 2 triangles ADE and ABC so now prove congruency by SAS congruency rule by
AD=AB
AC=AE
AND both the angles are given equal..
Hence BC=DE by cpct..
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It will be proof by SAS property.
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What are you looking for?