document.write( "Question 313677: Please help me prove that point A(-1,2), point B(2,4), point C(4,2) and point D(3,0) form a parallelogram. Thanks. \n" ); document.write( "
Algebra.Com's Answer #224275 by stanbon(75887)\"\" \"About 
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Please help me prove that point A(-1,2), point B(2,4), point C(4,2) and point D(3,0) form a parallelogram. Thanks.
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\n" ); document.write( "Plot the 4 corner points so you can see which sides would have to be parallel.
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\n" ); document.write( "Determine the slope of the opposing sides to see if they are the same.
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\n" ); document.write( "If the slopes are equal for each pair of opposite sides the figure
\n" ); document.write( "would be a parallelogram.
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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