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Answer:

see below

Explanation:

A parallelogram has ...

  • opposite sides parallel
  • opposite sides congruent
  • opposite angles congruent
  • adjacent angles supplementary

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If the opposite angles are supplementary (add up to 180°), then they must both be 90°, and the parallelogram is a rectangle.

It is NOT always true that opposite angles add up to 180°.

Help me answer this question-example-1
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