document.write( "Question 996837: Rotate polygon ABCD 90 degree counterclockwise about the origin.
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Algebra.Com's Answer #615154 by Edwin McCravy(20055)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "Rules for rotating points about the origin\r\n" );
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document.write( "1. The point (a,b) rotated 90° counterclockwise about \r\n" );
document.write( "the origin becomes (-b,a).\r\n" );
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document.write( "2. The point (a,b) rotated 180° counterclockwise about \r\n" );
document.write( "the origin becomes (-a,-a).\r\n" );
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document.write( "3. The point (a,b) rotated 270° counterclockwise (or\r\n" );
document.write( "90° clockwise) about the origin becomes (b,-a). \r\n" );
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document.write( "We use rule 1:\r\n" );
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document.write( "A(-4,2) becomes A'(-2,-4)\r\n" );
document.write( "B(1,3) becomes B'(-3,1)\r\n" );
document.write( "C(-2,1) becomes C'(-1,-2)\r\n" );
document.write( "D(-3,-2) becomes D'(2,-3)\r\n" );
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document.write( "The green polygon below rotated 90° counterclockwise \r\n" );
document.write( "about the origin becomes the red polygon:\r\n" );
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document.write( "Edwin
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