document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1067185>Question 1067185</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In triangle ABC,m<B  = 60 degree. Prove that<BR>\n" );
document.write( "m( AC)^2=(mAB)^2+(mBC)^2-(mAB).(mCB)\r<BR>\n" );
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document.write( "ABC is an isosceles triangle in which mAB =mAC.CD is the perpendicular drawn from C to the opposite side .Prove that (mBC)^2=2 (mAB).(mBD).<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 #682462 by </B><A HREF=/tutors/aboutme.mpl?userid=ikleyn><B>ikleyn(52803)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ikleyn><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=ikleyn><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=682462\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> .<BR>\n" );
document.write( "From the first phrase, cosine of the angle between AB and BC is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F2 ALIGN=MIDDLE  ALT=\"1%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" >, hence, the angle ABC is 60 degrees.\r<BR>\n" );
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