document.write( "Question 271945: A quadrilateral MUST be a parallelogram if it has ____ \n" ); document.write( "
Algebra.Com's Answer #198994 by Edwin McCravy(20060)\"\" \"About 
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\n" ); document.write( "A quadrilateral MUST be a parallelogram if it has both pairs of its opposite sides parallel.
\n" ); document.write( "A quadrilateral MUST be a parallelogram if it has both pairs of its opposite sides congruent (or equal in measure).
\n" ); document.write( "A quadrilateral MUST be a parallelogram if it has one pair of opposite sides both parallel and congruent.
\n" ); document.write( "A quadrilateral MUST be a parallelogram if it has both pairs of its opposite angles congruent (or equal in measure).
\n" ); document.write( "A quadrilateral MUST be a parallelogram if it has both diagonals bisecting each other.
\n" ); document.write( "A quadrilateral MUST be a parallelogram if it has all of its pairs of consecutive angles supplementary. \r
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