document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=220101>Question 220101</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I've tried this a couple different ways, but the answer wasn't right.<BR>\n" );
document.write( "I know that the standard equation for a circle with the center at the origin is <BR>\n" );
document.write( "X^2 + Y^2= r^2<BR>\n" );
document.write( "but I can't figure out how to find the radius. <BR>\n" );
document.write( "Center at origin and containing the point (-2,3)<BR>\n" );
document.write( "I've tried using the midpoint formula, distance formula and also inputing the given point into the standard equation for which I got 15. But I'm supposed to end up with 13 for the radius. What am I doing wrong? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #165320 by </B><A HREF=/tutors/aboutme.mpl?userid=nerdybill><B>nerdybill(7384)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=nerdybill><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=nerdybill><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=165320\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> \r<BR>\n" );
document.write( "\n" );
document.write( "As you say, you want the distance between:<BR>\n" );
document.write( "(0,0) and (-2,3)<BR>\n" );
document.write( ".<BR>\n" );
document.write( "Distance formula:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%28%28x2-x1%29%5E2%2B%28y2-y1%29%5E2%29 ALIGN=MIDDLE  ALT=\"sqrt%28%28x2-x1%29%5E2%2B%28y2-y1%29%5E2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( ".<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%28%28-2-0%29%5E2%2B%283-0%29%5E2%29 ALIGN=MIDDLE  ALT=\"sqrt%28%28-2-0%29%5E2%2B%283-0%29%5E2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%28%28-2%29%5E2%2B%283%29%5E2%29 ALIGN=MIDDLE  ALT=\"sqrt%28%28-2%29%5E2%2B%283%29%5E2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%284%2B9%29 ALIGN=MIDDLE  ALT=\"sqrt%284%2B9%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%2813%29 ALIGN=MIDDLE  ALT=\"sqrt%2813%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "That is the radius.<BR>\n" );
document.write( "However, if you see it in:<BR>\n" );
document.write( "X^2 + Y^2= r^2<BR>\n" );
document.write( "You might square it to get your 13.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );