document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=3915>Question 3915</A>: <I><SPAN STYLE=\"word-break: break-all;\"> area of a regular pentagon inscribed in a circle of radius 12cm.        </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #1714 by </B><A HREF=/tutors/aboutme.mpl?userid=khwang><B>khwang(438)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=khwang><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=1714\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  This question is somehow very unclear ,it did not show what the given<BR>\n" );
document.write( " conditions are and what you ask for ???\r<BR>\n" );
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document.write( " I think it should be given the length of a chord on a circle. Then try<BR>\n" );
document.write( " to find the distance from its mid point to the circumference of the circle ?\r<BR>\n" );
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document.write( "                P<BR>\n" );
document.write( "                 | M<BR>\n" );
document.write( "           ------|-------<BR>\n" );
document.write( "          A      |       B<BR>\n" );
document.write( "                 |<BR>\n" );
document.write( "                 |<BR>\n" );
document.write( "                 | O<BR>\n" );
document.write( "  Here, AB is the chord,O is the center, P is on the circumference of<BR>\n" );
document.write( "  the circle and M is the midpoint of AB.\r<BR>\n" );
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document.write( "  We see that OB^2 = MB^2 + OM^2, let AB = L, OB = r.<BR>\n" );
document.write( "  We have OM = sqrt(r^2 - 1/4 L^2) <BR>\n" );
document.write( "  and so PM = OP - OM = r - sqrt(r^2 - 1/4 L^2).<BR>\n" );
document.write( " <BR>\n" );
document.write( "  Also, I don't think any further explanations are necessary. <BR>\n" );
document.write( "  Try to figure out the details if you have trouble understanding.\r<BR>\n" );
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document.write( "  Kenny<BR>\n" );
document.write( "  \r<BR>\n" );
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document.write( "  \r<BR>\n" );
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document.write( "  </SPAN>\n" );
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