Respuesta :

17) Sometimes true

  • Given only that a quadrilateral is a parallelogram, we can only conclude the opposite sides are congruent - not the adjacent sides

18) Always true

  • Adjacent angles of a parallelogram are supplementary.

19) Always true.

  • Opposite sides of a parallelogram are congruent.

20) Never true

  • Diagonals of a parallelogram bisect each other, meankng that MR = RP.
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