document.write( "Question 1185345: Find the area of a quadrilateral having the points (-3, 4), (-2, -1), (4, 4) and (0, 5)
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Algebra.Com's Answer #816157 by Alan3354(69443) $\"\"$ $\"About$

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Find the area of a quadrilateral having the points A(-3,4), B(-2,-1), C(4,4) and D(0,5) as vertices.
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document.write( " A   B   C   D   A\r\n" );
document.write( "-3  -2   4   0  -3\r\n" );
document.write( " 4  -1   4   5   4\r\n" );
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document.write( "Add the diagonal products starting at the upper left.\r\n" );
document.write( "--> 3  -8  +20  + 0 = 15\r\n" );
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document.write( "Add the diagonal products starting at the lower left.\r\n" );
document.write( "--> -8 -4 + 0 -15 = -27\r\n" );
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\n" ); document.write( "The difference is 42.
\n" ); document.write( "The area is 1/2 that = 21 sq units. \n" ); document.write( "

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