document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=809841>Question 809841</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Point C (4,2) is on circle O with a center (4, -2).<BR>\n" );
document.write( "Segment CD is a diameter of circle O.<BR>\n" );
document.write( "If circle O intersects the x-axis at A and B what is the ratio of the length of arc ACB to the length of arc ADB? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #487831 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39620)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=487831\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> You are mainly looking for points A and B, for which y=0.\r<BR>\n" );
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document.write( "Checking about the circle, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28x-4%29%5E2%2B%28y%2B2%29%5E2=r%5E2 ALIGN=MIDDLE  ALT=\"%28x-4%29%5E2%2B%28y%2B2%29%5E2=r%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" >.<BR>\n" );
document.write( "You use distance formula to find r, which is distance from C to O.  This is easy to see on a graph, since the two points are on the vertical line x=4.  The radius is (2)+|-2|=4.  No need for the distance formula in this case.  Then the circle's equation is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28x-4%29%5E2%2B%28y%2B2%29%5E2=4%5E2+ ALIGN=MIDDLE  ALT=\"%28x-4%29%5E2%2B%28y%2B2%29%5E2=4%5E2+\"   DISABLED_style= \"max-width:90%; height:auto;\" >.\r<BR>\n" );
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document.write( "Does a graph give you some idea how to complete answering the question?\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=graph%28300%2C300%2C-9%2C9%2C-9%2C9%2C-2%2Bsqrt%2816-%28x-4%29%5E2%29%2C-2-sqrt%2816-%28x-4%29%5E2%29%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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