document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=20390>Question 20390</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How do I find the centre of a circle ? I done this in high school, but that was 25 years ago, and now I just can't remember it. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #9828 by </B><A HREF=/tutors/aboutme.mpl?userid=AnlytcPhil><B>AnlytcPhil(1806)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=AnlytcPhil><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/cgi-bin/show-face.mpl?user=AnlytcPhil><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=9828\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  How do I find the centre of a circle ? I done this in high school, but that was 25 years ago, and now I just can't remember it.\r<BR>\n" );
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document.write( "Use two theorems:\r<BR>\n" );
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document.write( "1. The perpendicular bisector of a chord is a diameter.<BR>\n" );
document.write( "2. The midpoint of a diameter is the center.\r<BR>\n" );
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document.write( "So, draw a chord.  Draw its perpendicular bisector, which is a diameter.  Then find its midpoint.  This is the center.\r<BR>\n" );
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document.write( "Edwin<BR>\n" );
document.write( "AnlytcPhil@aol.com\r<BR>\n" );
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