document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=192611>Question 192611</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Determine if triangle ABC is a right triangle if it's verticies are A(-9,-2), B(-4,-4), C(-6,-9). </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #144597 by </B><A HREF=/tutors/aboutme.mpl?userid=RAY100><B>RAY100(1637)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=RAY100><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=144597\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> check  slope  os  AB  and  BC\r<BR>\n" );
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document.write( "m(AB) = ( y2-y1)/(x2-x1)=(-2--4)/(-9--4)=(2)/(-5) =(-2/5)\r<BR>\n" );
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document.write( "m(BC) = (-4--9)/(-4--6) = (5/2)\r<BR>\n" );
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document.write( "as  slopes  are  negative  reciprocals,  m(AB)=-1/m(BC),  they  are  perpendicular\r<BR>\n" );
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document.write( "as  such  angle  ABC  is  90  degrees  and  triangle  is  a  right  triangle  by  definition </SPAN>\n" );
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