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AS AB=AC. ABC =ACB
BAD =CAE
ADDING ...ABC+BAD= ACB+ CAE
=>BDA = AEC
=>DAE + AED= DAE + ADE
=> AED = ADE
HENCE THE ∆ADE IS ISOSCELES
BAD =CAE
ADDING ...ABC+BAD= ACB+ CAE
=>BDA = AEC
=>DAE + AED= DAE + ADE
=> AED = ADE
HENCE THE ∆ADE IS ISOSCELES
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