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If the same side interior angles is not supplementary why do we know that the lines are not parallel

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If the same side interior angles is not supplementary why do we know that the lines-example-1
User Sgedda
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Answer:

The same-side interior angle theorem states that when two lines that are parallel are intersected by a transversal line, the same-side interior angles that are formed are supplementary, or add up to 180 degrees

Explanation:

User Paul Biggar
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