3. Can a quadrilateral ABCD be a parallelogram if

    (i) \angle D + \angle B = 180\degree

    

Answers (1)

   (i) \angle D + \angle B = 180\degree

Opposite angles should be equal and adjacent angles should be supplemantary to each other.

\angle B,\angle D are opposite angles.

Hence,a quadrilateral ABCD can be parallelogram but it is not conform.

 

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