document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=314589>Question 314589</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Using the law of cosines, find the angle measures of triangle with sides 55, 75, and 80. Round to the nearest degree. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #224946 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=224946\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Using the law of cosines, find the angle measures of triangle with sides 55, 75, and 80. Round to the nearest degree.<BR>\n" );
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document.write( "Let a = 55, b = 75, c = 80<BR>\n" );
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document.write( "Cos(A) = (b^2+c^2-a^2)/2bc<BR>\n" );
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document.write( "Cos(A) = 0.75<BR>\n" );
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document.write( "A = cos^-1(0.75) = 41.41 degrees<BR>\n" );
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document.write( "Use the same procedure to find the measure of angle \"B\".<BR>\n" );
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document.write( "Then C = 180-(A+B)<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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