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In a parallelogram, adjacent angles are:

  • A.Equal
  • B.Complementary
  • C.Supplementary
  • D.Right angles

Answer: C

Adjacent angles of a parallelogram lie between the same pair of parallel sides, so they are supplementary:

\[ \angle A + \angle B = 180^{\circ} \]

Opposite angles are the equal ones - the pair this question is testing against.

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