document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=202530>Question 202530</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Determine the measure of the interior angle at vertex A.<BR>\n" );
document.write( "It is a pentagon, at vertex A is 3x   This is how it is set up\r<BR>\n" );
document.write( "\n" );
document.write( "                                                4x<BR>\n" );
document.write( "                                            4x      4x<BR>\n" );
document.write( "                                          3x           3x vertex A<BR>\n" );
document.write( "Answers <BR>\n" );
document.write( "A. 150 B. 50 C.90 D.30<BR>\n" );
document.write( "The answer is 90 but can't figure out how they got it.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #152729 by </B><A HREF=/tutors/aboutme.mpl?userid=Earlsdon><B>Earlsdon(6294)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Earlsdon><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=152729\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> You can start with the formula for the sum (S) of the interior angles of a polygon with n sides:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=S+=+%28n-2%29%2A180 ALIGN=MIDDLE  ALT=\"S+=+%28n-2%29%2A180\"   DISABLED_style= \"max-width:90%; height:auto;\" > In this problem, you have a pentagon so n =5.<BR>\n" );
document.write( "The sum of the interior angles can be expressed as:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=S+=+4x%2B4x%2B4x%2B3x%2B3x ALIGN=MIDDLE  ALT=\"S+=+4x%2B4x%2B4x%2B3x%2B3x\"   DISABLED_style= \"max-width:90%; height:auto;\" > Add up the x's.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=S+=+18x ALIGN=MIDDLE  ALT=\"S+=+18x\"   DISABLED_style= \"max-width:90%; height:auto;\" > Now set this equal to <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28n-2%29%2A180 ALIGN=MIDDLE  ALT=\"%28n-2%29%2A180\"   DISABLED_style= \"max-width:90%; height:auto;\" > where n = 5 (for pentagon).<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%285-2%29%2A180+=+18x ALIGN=MIDDLE  ALT=\"%285-2%29%2A180+=+18x\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3%2A180+=+18x ALIGN=MIDDLE  ALT=\"3%2A180+=+18x\"   DISABLED_style= \"max-width:90%; height:auto;\" > Divide both sides by 18.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3%2A10+=+x ALIGN=MIDDLE  ALT=\"3%2A10+=+x\"   DISABLED_style= \"max-width:90%; height:auto;\" > so that...<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+30 ALIGN=MIDDLE  ALT=\"x+=+30\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "The angle at vertex A is 3*x, so...<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3x+=+3%2A30 ALIGN=MIDDLE  ALT=\"3x+=+3%2A30\"   DISABLED_style= \"max-width:90%; height:auto;\" >=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=90 ALIGN=MIDDLE  ALT=\"90\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28A+=+90%29 ALIGN=MIDDLE  ALT=\"highlight%28A+=+90%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );