document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1209579>Question 1209579</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In the diagram, $ABCD$ is a square. Find $PR.$\r<BR>\n" );
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document.write( "[asy]<BR>\n" );
document.write( "unitsize(1.5 cm);\r<BR>\n" );
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document.write( "pair A, B, C, D, P, R;\r<BR>\n" );
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document.write( "A = (-1,1);<BR>\n" );
document.write( "B = (1,1);<BR>\n" );
document.write( "C = (1,-1);<BR>\n" );
document.write( "D = (-1,-1);<BR>\n" );
document.write( "P = (0,1) + dir(50);<BR>\n" );
document.write( "R = -P;\r<BR>\n" );
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document.write( "draw(A--B--C--D--cycle);<BR>\n" );
document.write( "draw(A--P--B);<BR>\n" );
document.write( "draw(C--R--D);\r<BR>\n" );
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document.write( "label(\"$A$\", A, W);<BR>\n" );
document.write( "label(\"$B$\", B, dir(0));<BR>\n" );
document.write( "label(\"$C$\", C, dir(0));<BR>\n" );
document.write( "label(\"$D$\", D, W);<BR>\n" );
document.write( "label(\"$P$\", P, N);<BR>\n" );
document.write( "label(\"$R$\", R, S);<BR>\n" );
document.write( "label(\"$4$\", (B + P)/2, NE, red);<BR>\n" );
document.write( "label(\"$8$\", (A + P)/2, NW, red);<BR>\n" );
document.write( "label(\"$4 \sqrt{5}$\", (A + B)/2, S, red);<BR>\n" );
document.write( "label(\"$4$\", (D + R)/2, SW, red);<BR>\n" );
document.write( "label(\"$8$\", (C + R)/2, SE, red);<BR>\n" );
document.write( "label(\"$4 \sqrt{5}$\", (C + D)/2, N, red);<BR>\n" );
document.write( "[/asy]\r<BR>\n" );
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document.write( "AB=BC=CD=DA=4sqrt5<BR>\n" );
document.write( "PA=CR=8<BR>\n" );
document.write( "PB=RD=4 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #849557 by </B><A HREF=/tutors/aboutme.mpl?userid=ikleyn><B>ikleyn(52781)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ikleyn><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=ikleyn><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=849557\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> .\r<BR>\n" );
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document.write( "Hello, I am writing to let you know (in case if you don't know it): \r<BR>\n" );
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document.write( "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this site/forum is for Math problems.\r<BR>\n" );
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document.write( "It is expected that the visitors bring formulations of Math problems in traditional wording form.\r<BR>\n" );
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document.write( "If necessary, the wording description can be accompanied by a diagram or a link to a diagram.\r<BR>\n" );
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document.write( "But posting computer programs in the language of graphing tools is not what we expect from visitors.\r<BR>\n" );
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document.write( "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Do you get the meaning of my message?\r<BR>\n" );
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document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );