triangle ABC is an isosceles triangle, with AB=AC.If CE is drawn parallel to AB such that AE bisect exterior<CAD . prove that (a)  <DAE=<ABC  (b)ABCE is a parallelogram.

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if a trangle is ABC is a isosceles traingle . AC = AB  . so BC is not equal to AC and AB . if  angle AE biscest  exterior  and EC  will be join as well . so it will form a parallelogram
the answer of set b 
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