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8 October, 04:10

By the definition of a parallelogram, AB∥DC. AD is a transversal between these sides, so ∠A and ∠D are angles. Because AB and DC are, the same-side interior angles must be by the same-side interior angles theorem. Therefore, ∠A and ∠D are supplementary.

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  1. 8 October, 06:41
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    Step-by-step explanation:

    1. same side interior

    2. parallel

    3. supplementary
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