Question
Which pair of lines in the below figure is parallel? Give reasons.
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Answer
$\angle A +\angle B =115+65=180^{\circ}$ Therefore, $AB \| BC$ [As sum of co interior angles are supplementary $]$ $\angle B +\angle C =65+115=180^{\circ}$ Therefore, $AB \| CD$ [As sum of interior angles are supplementary $]$
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