document.write( "Question 260453: Given: A (4,3), B (8,3), C (9,10), and D (5,10) are vertices of a quadrilateral. Is quadrilateral ABCD a parallelogram? Use mathmatics to justify your answer. (graphing is not acceptable) .... I need an example or this answer cause im very confused....Thank you \n" ); document.write( "
Algebra.Com's Answer #191847 by stanbon(75887)\"\" \"About 
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Given: A (4,3), B (8,3), C (9,10), and D (5,10) are vertices of a quadrilateral. Is quadrilateral ABCD a parallelogram? Use mathmatics to justify your answer. (graphing is not acceptable)
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\n" ); document.write( "Plot the points so you can see what is happening.
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\n" ); document.write( "Is ABCD a parallelogram?
\n" ); document.write( "Check the slopes of opposite sides.
\n" ); document.write( "ABslope: (3-3)/(8-4)= 0
\n" ); document.write( "CDslope: (10-10)/(5-9) = 0
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\n" ); document.write( "BCslope: (10-3)/(9-8) = 7/1
\n" ); document.write( "ADslope: 7/1
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\n" ); document.write( "Opposite sides are parallel so it is a parallelogram.
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "
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