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