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3. Can a quadrilateral ABCD be a parallelogram if

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

Answers (1)

S seema garhwal

(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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