document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=677084>Question 677084</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Use the concept of slope to determine whether the given figure is a right triangle (i.e., does the triangle contain a right angle?). Here are the coordinate points of the triangle.  (-2,5) and (6,1) and (-1,2).  Is this a right triangle?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #421498 by </B><A HREF=/tutors/aboutme.mpl?userid=ReadingBoosters><B>ReadingBoosters(3246)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ReadingBoosters><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=421498\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> To form a right angle, the lines must be perpendicular.  <BR>\n" );
document.write( "Perpendicular lines have negative inverse slopes.<BR>\n" );
document.write( "...<BR>\n" );
document.write( "(-2,5) and (6,1)<BR>\n" );
document.write( "slope = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%285-1%29%2F%28-2-6%29+=+4%2F-8+=+-1%2F2 ALIGN=MIDDLE  ALT=\"%285-1%29%2F%28-2-6%29+=+4%2F-8+=+-1%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "...<BR>\n" );
document.write( "(-2,5) and (-1,2)<BR>\n" );
document.write( "slope = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%285-2%29%2F%28-2--1%29+=+3%2F-1+=+-3 ALIGN=MIDDLE  ALT=\"%285-2%29%2F%28-2--1%29+=+3%2F-1+=+-3\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "...<BR>\n" );
document.write( "(6,1) and (-1,2)<BR>\n" );
document.write( "slope = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%281-2%29%2F%286--1%29+=+-1%2F7 ALIGN=MIDDLE  ALT=\"%281-2%29%2F%286--1%29+=+-1%2F7\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "...<BR>\n" );
document.write( "The endpoints do NOT create a right triangle, as not of the line segments are perpendicular.<BR>\n" );
document.write( ".....................<BR>\n" );
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document.write( "</TD></TR></TABLE>\n" );