document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=736910>Question 736910</A>: <I><SPAN STYLE=\"word-break: break-all;\"> the points (7,6) (-1,6) and (7,-2) are the vertices of a rectangle . find the coordinates of the fourth vertex. please help me understand this question. thanks<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #450053 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><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=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=450053\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> This problem is made a little easier by the<BR>\n" );
document.write( "fact that the line segments formed by the<BR>\n" );
document.write( "given points are horizontal and vertical..<BR>\n" );
document.write( "I'll label the points:<BR>\n" );
document.write( "A( 7,6 )<BR>\n" );
document.write( "B( -1,6 )<BR>\n" );
document.write( "C( 7,-2 )<BR>\n" );
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document.write( "Notice that the line formed by AB has the same<BR>\n" );
document.write( "y coordinate at both ends. This means that the<BR>\n" );
document.write( "line HAS to be horizontal.<BR>\n" );
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document.write( "Notice that the line formed by AC has the same<BR>\n" );
document.write( "x coordinate at both ends. This means that the<BR>\n" );
document.write( "line HAS to be vertical<BR>\n" );
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document.write( "The line formed by BC doesn't have either an<BR>\n" );
document.write( "x or a y that are the same, so this forms a<BR>\n" );
document.write( "diagonal.<BR>\n" );
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document.write( "BC has endpoints ( -1,6 ) and ( 7,-2 )<BR>\n" );
document.write( "The y-coordinate of 6 and<BR>\n" );
document.write( "the x-coordinate of 7 are shared with the<BR>\n" );
document.write( "other 2 lines, so ( -1,-2 ) must be the new<BR>\n" );
document.write( "point.<BR>\n" );
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document.write( "You really should plot this on graph paper.<BR>\n" );
document.write( "It's the only way to see what's going on.<BR>\n" );
document.write( "You end up with a square that is 8 units<BR>\n" );
document.write( "on each side </SPAN>\n" );
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