document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=139977>Question 139977</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/1559534591/algebrahomeworkh>dicovering geometry</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> ok the problem i need help on <BR>\n" );
document.write( "if \r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "find the exact area of a regular dodecagon inscribed in circle with the radius R </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #102018 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=102018\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A regular dodecagon has 12 equal sides.<BR>\n" );
document.write( "The radius of the dodecagon is equal to the radius of the circumscribed circle.<BR>\n" );
document.write( "Using the formula for the area of a regular polygon of n sides and having a radius R:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+%281%2F2%29nR%5E2Sin%28360%2Fn%29 ALIGN=MIDDLE  ALT=\"A+=+%281%2F2%29nR%5E2Sin%28360%2Fn%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > Substitute n = 12 and simplify.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+%281%2F2%29%2812%29R%5E2Sin%28360%2F12%29 ALIGN=MIDDLE  ALT=\"A+=+%281%2F2%29%2812%29R%5E2Sin%28360%2F12%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+6R%5E2Sin%2830%29 ALIGN=MIDDLE  ALT=\"A+=+6R%5E2Sin%2830%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+6R%5E2%280.5%29 ALIGN=MIDDLE  ALT=\"A+=+6R%5E2%280.5%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+3R%5E2 ALIGN=MIDDLE  ALT=\"A+=+3R%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" >...and since the value of R is not provided, this is as far as we can go!<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );