Question 271945
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A quadrilateral MUST be a parallelogram if it has <u> both pairs of its opposite sides parallel.</u> 
A quadrilateral MUST be a parallelogram if it has <u> both pairs of its opposite sides congruent (or equal in measure).</u> 
A quadrilateral MUST be a parallelogram if it has <u> one pair of opposite sides both parallel and congruent.</u> 
A quadrilateral MUST be a parallelogram if it has <u> both pairs of its opposite angles congruent (or equal in measure).</u> 
A quadrilateral MUST be a parallelogram if it has <u> both diagonals bisecting each other.</u> 
A quadrilateral MUST be a parallelogram if it has <u> all of its pairs of consecutive angles supplementary.</u> 

Edwin