document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=322095>Question 322095</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The greatest angle of a triangle ABC whose sides are a=5, b=5&#8730;3 and c=5 ,is ? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #231315 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=231315\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The greatest angle of a triangle ABC whose sides are a=5, b=5&#8730;3 and c=5 ,is ?<BR>\n" );
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document.write( "a = c so it's an isoceles triangle.<BR>\n" );
document.write( "b is the longest side, so the angle opposite is the largest.<BR>\n" );
document.write( "Use the Cosine Law:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b%5E2+=+a%5E2+%2B+c%5E2+-+2ac%2Acos%28B%29 ALIGN=MIDDLE  ALT=\"b%5E2+=+a%5E2+%2B+c%5E2+-+2ac%2Acos%28B%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cos%28B%29+=+%28-b%5E2+%2B+a%5E2+%2B+c%5E2%29%2F%282ac%29 ALIGN=MIDDLE  ALT=\"cos%28B%29+=+%28-b%5E2+%2B+a%5E2+%2B+c%5E2%29%2F%282ac%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "cos(B) = (-75 + 25 + 25)/2*5*5<BR>\n" );
document.write( "cos(B) = -25/50 = -0.5<BR>\n" );
document.write( "B = 120º<BR>\n" );
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