Proving a quadrilateral is a parallelogram

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Proving a quadrilateral is a parallelogram

• 9.2

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Theorem 9-5

• If the diagonals of a quadrilateral bisect each
  other then the quadrilateral is a parallelogram

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Theorem 9-6

• If one pair of opposite sides of a quadrilateral
  are both congruent and parallel then the
  quadrilateral is a parallelogram

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Theorem 9-7

• If both pairs of opposite sides of a
  quadrilateral are congruent then the
  quadrilateral is a parallelogram

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Theorem 9-8

• If both pairs of opposite angles of a
  quadrilateral are congruent then the
  quadrilateral is a parallelogram

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Homework

• P. 457 1-20,27,28