document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=996837>Question 996837</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Rotate polygon ABCD 90 degree counterclockwise about the origin.<BR>\n" );
document.write( "A(-4,2)<BR>\n" );
document.write( "B(1,3)<BR>\n" );
document.write( "C(-2,1)<BR>\n" );
document.write( "D(-3,-2)<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #615156 by </B><A HREF=/tutors/aboutme.mpl?userid=Theo><B>Theo(13342)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Theo><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=Theo><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=615156\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> here's a reference on rotations.\r<BR>\n" );
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document.write( "<a  rel=nofollow HREF= \"http://www.regentsprep.org/regents/math/geometry/gt4/Rotate.htm\" target = \"_blank\">http://www.regentsprep.org/regents/math/geometry/gt4/Rotate.htm</a>\r<BR>\n" );
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document.write( "basically, a rotation of 90 degrees counterclockwise results in (x,y) becoming (-y,x).\r<BR>\n" );
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document.write( "(-4,2) becomes (-2,-4)<BR>\n" );
document.write( "(1,3) becomes (-3,1)<BR>\n" );
document.write( "(-2,1) becomes (-1,-2)<BR>\n" );
document.write( "(-3,-2) becomes (2,-3)\r<BR>\n" );
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document.write( "if you look at each of those points individually, and extend a line from each point to the origin, you will see that they form a 90 degree angle.\r<BR>\n" );
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document.write( "here's what the original and the transformed point A looks like.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" src = \"http://theo.x10hosting.com/2015/101506.jpg\" alt=\"$$$\" </>\r<BR>\n" );
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