Question 416957
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Hi
is having One pair of consecutive angles are congruent 
enough information to prove a quadrilateral is a parallelogram?
  NO, one of the following conditions must be shown to be true.
1) If a quadrilateral has one pair of sides that are both parallel and congruent, 
then the quadrilateral is a parallelogram. 
2) If the opposite sides of a quadrilateral are congruent, 
then then quadrilateral is a parallelogram. 
3) Opposites sides are parallel. 
4) 'Opposite angles are congruent' 
5) Diagonals bisect each other.