Proving a quadrilateral is a parallelogram

1
Proving a quadrilateral is a parallelogram
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A quadrilateral is a Parallelogram if and only if

• Opposite sides have equal slopes
• Opposite sides are parallel
• Opposite angles are congruent
• Opposite sides are congruent
• Consecutive angles are supplementary
• Diagonals bisect each other

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A quadrilateral is a parallelogram if

• One pair of sides is congruent and parallel.

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Problems?

• Find a value for x that would make the
  quadrilateral a parallelogram.
• P. 301 7-12
• Practice p. 301-302 15--30