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प्रश्न
Which pair of lines in the below fig, is parallel? Given reasons.
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उत्तर
`∠`A + `∠`B =115 + 65 =180°
∴AB || BC [As sum of co-interior angles we supplementary]
`∠`B + `∠`C = 65 +115 = 180°
∴AB || CD [As sum of interior angles are supplementary]
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