document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=892175>Question 892175</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Use Law of Cosines to prove the measures of angles A, B, and C in the triangle below are equal. Then find the exact value of cos A and explain why that value implies mA = 60°.<BR>\n" );
document.write( "https://wca.sooschools.com/media/g_geo_ccss_2013/11/geo_10a_17_10_triangle.gif </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #540342 by </B><A HREF=/tutors/aboutme.mpl?userid=Fombitz><B>Fombitz(32388)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Fombitz><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=Fombitz><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=540342\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=c%5E2=a%5E2%2Bb%5E2-2ab%2Acos%28C%29 ALIGN=MIDDLE  ALT=\"c%5E2=a%5E2%2Bb%5E2-2ab%2Acos%28C%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3%5E2=3%5E2%2B3%5E2-2%283%29%283%29cos%28C%29 ALIGN=MIDDLE  ALT=\"3%5E2=3%5E2%2B3%5E2-2%283%29%283%29cos%28C%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0=9-18cos%28C%29 ALIGN=MIDDLE  ALT=\"0=9-18cos%28C%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=18cos%28C%29=9 ALIGN=MIDDLE  ALT=\"18cos%28C%29=9\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cos%28C%29=1%2F2 ALIGN=MIDDLE  ALT=\"cos%28C%29=1%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=C=60 ALIGN=MIDDLE  ALT=\"C=60\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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