document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=433802>Question 433802</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Im stuck on a proof. there is 3 spots 1 and 2 and 3 and no 0 for given. Problem : Prove that ABCD is a parallelogram. A = (-1, 10), B = (6,8), C = (3,-2) D = (-4,0) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #300688 by </B><A HREF=/tutors/aboutme.mpl?userid=shree840><B>shree840(260)</B></A><img src=\"/images/stars/stars-09.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=shree840><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=shree840><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=300688\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A (-1,10)<BR>\n" );
document.write( "b (6,8)<BR>\n" );
document.write( "c (3,-2)<BR>\n" );
document.write( "d(-4,0)\r<BR>\n" );
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document.write( "we need to prove ab is parallel to cd<BR>\n" );
document.write( "                  ad is parallel to bc\r<BR>\n" );
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document.write( "m1(ab)=(8-10)/(6--1)=-2/7<BR>\n" );
document.write( "m2(cd)=(0--2)/(-4-3)=2/-7=-2/7<BR>\n" );
document.write( "m3(ad)=(0-10)/(-4--1)=-10/-3=10/3<BR>\n" );
document.write( "m4(bc)=(-2-8)/(3-6)=-10/-3=10/3\r<BR>\n" );
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document.write( "Hence  it is a parallelogram  ANS\r<BR>\n" );
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document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );