document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1101442>Question 1101442</A>: <I><SPAN STYLE=\"word-break: break-all;\"> if the vertices of a triangle are A (1,3) B (3,4) and C (1,-4) find its area.\r<BR>\n" );
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document.write( "A) 10<BR>\n" );
document.write( "B) 7<BR>\n" );
document.write( "C)9<BR>\n" );
document.write( "D)12<BR>\n" );
document.write( "E) 18 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #716030 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=716030\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> if the vertices of a triangle are A (1,3) B (3,4) and C (1,-4) find its area. <BR>\n" );
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document.write( "Here's another method.<BR>\n" );
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document.write( " A   B   C   A\r\n" );
document.write( " 1   3   1   1\r\n" );
document.write( " 3   4  -4   3\r\n" );
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document.write( "Add the diagonal products starting at the upper left.<BR>\n" );
document.write( "4 -12 + 3 = -5<BR>\n" );
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document.write( "Add the diagonal products starting at the lower left.<BR>\n" );
document.write( "9 +4 -4 = 9<BR>\n" );
document.write( "The difference is 14<BR>\n" );
document.write( "The area is 1/2 that,<BR>\n" );
document.write( "Area = 7 sq units<BR>\n" );
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document.write( "This methods works for ALL polygons, any number of sides.<BR>\n" );
document.write( "The points must be in order around the polygon.\r<BR>\n" );
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document.write( " </SPAN>\n" );
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