document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=281782>Question 281782</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The measures of the sides of an isosceles triangle are 10, 10, and 4. Find the measure of a base angle to the nearest degree. <BR>\n" );
document.write( "a. 23<BR>\n" );
document.write( "b. 60<BR>\n" );
document.write( "c. 78<BR>\n" );
document.write( "d. 85 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #204714 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=204714\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The measures of the sides of an isosceles triangle are 10, 10, and 4. Find the measure of a base angle to the nearest degree.<BR>\n" );
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document.write( "Use Law of Cosines:<BR>\n" );
document.write( "cos(A) = (b^2 + c^2 - a^2)/2bc<BR>\n" );
document.write( "Find the angle opposite 4:<BR>\n" );
document.write( "cos(A) = (10^2 + 10^2-4^2)/(2*10*10)<BR>\n" );
document.write( "cos(A) = (84)/200 = 0.42<BR>\n" );
document.write( "cos^-1(0.42) = 65 degrees<BR>\n" );
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document.write( "Each base angle = (180-65)/2 = 57.5 degrees\r<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.\r<BR>\n" );
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document.write( " <BR>\n" );
document.write( "a. 23<BR>\n" );
document.write( "b. 60<BR>\n" );
document.write( "c. 78<BR>\n" );
document.write( "d. 85<BR>\n" );
document.write( " </SPAN>\n" );
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