Mathematics
Two lines AB and CD are not parallel to each other, when they are cut by a transversal with:
vertically opposite angles are equal.
corresponding angles are equal
alternate angles are equal
co-interior angles are supplementary.
Quadrilaterals Constructions
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Answer
Two lines AB and CD are not parallel to each other when they are cut by a transversal if the vertically opposite angles are equal.
Hence, option 1 is the correct option.
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