document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=878669>Question 878669</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The measure of the vertex angle of an isosceles  triangle is 50 degrees. Find the measure of an exterior angle to one of the base angles of the triangle. \r<BR>\n" );
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document.write( "These are the choices given in my math book.<BR>\n" );
document.write( "(A) 65 degrees<BR>\n" );
document.write( "(B) 125 degrees<BR>\n" );
document.write( "(C) 115 degrees<BR>\n" );
document.write( "(D) 80 degrees </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #530185 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=530185\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let x = the measure of the base angle\r<BR>\n" );
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document.write( "There are two congruent base angles in the isosceles triangle. The 3 angles of the triangle must add to 180 degrees. This means, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%2Bx%2B50=180 ALIGN=MIDDLE  ALT=\"x%2Bx%2B50=180\"   DISABLED_style= \"max-width:90%; height:auto;\" >, solve for x to get\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%2Bx%2B50=180 ALIGN=MIDDLE  ALT=\"x%2Bx%2B50=180\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2x%2B50=180 ALIGN=MIDDLE  ALT=\"2x%2B50=180\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2x=180-50 ALIGN=MIDDLE  ALT=\"2x=180-50\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2x=130 ALIGN=MIDDLE  ALT=\"2x=130\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=130%2F2 ALIGN=MIDDLE  ALT=\"x=130%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=65 ALIGN=MIDDLE  ALT=\"x=65\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "So the base angle is 65 degrees. This is an interior angle. We want an exterior angle. So if y is an exterior angle to the 65 degree angle, then\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y%2B65=180 ALIGN=MIDDLE  ALT=\"y%2B65=180\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=180-65 ALIGN=MIDDLE  ALT=\"y=180-65\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=115 ALIGN=MIDDLE  ALT=\"y=115\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Making the final answer <font color=\"red\">(C) 115 degrees</font> </SPAN>\n" );
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