document.write( "Question 1059680: Find the area of a parallelogram with vertices (0, 0), (3, 3), (4, 6), and (7, 9) \n" ); document.write( "
Algebra.Com's Answer #807983 by ikleyn(52788)\"\" \"About 
You can put this solution on YOUR website!
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\n" ); document.write( "\n" ); document.write( "It is clear from the first glance that the answer/(the solution) by @Penguin is not correct.\r
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\n" ); document.write( "\n" ); document.write( "It is seen from the fact that the four given points are not collinear.\r
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\n" ); document.write( "\n" ); document.write( "So, the solution by @Penguin is wrong.\r
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\n" ); document.write( "\n" ); document.write( "Where the mistake is ?\r
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\n" ); document.write( "\n" ); document.write( "--- The mistake is in incorrect using the Shoelace theorem.\r
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\n" ); document.write( "\n" ); document.write( "To apply this formula, the vertices must be listen in the clockwise (or anti-clockwise) order.\r
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\n" ); document.write( "\n" ); document.write( "In this case, @Penguin failed to apply the formula correctly - it is the mistake' source.\r
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