document.write( "Question 256338: Triangle DEG has the coordinates D(-1,1), E(5,-1) and G(4,5) Triangle DEG is rotated 90degrees about the origin to form triangleD'E'G'. State the coordinates of the vertices D', E', and G'. \n" ); document.write( "
Algebra.Com's Answer #188612 by Edwin McCravy(20056)\"\" \"About 
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Triangle DEG has the coordinates D(-1,1), E(5,-1) and G(4,5) Triangle DEG is rotated 90 degrees about the origin to form (triangle)D'E'G'. State the coordinates of the vertices D', E', and G'.
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document.write( "You didn't state whether the rotation is clockwise or counter-clockwise,\r\n" );
document.write( "so I'll do it both ways:\r\n" );
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document.write( "Here are the rules:\r\n" );
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document.write( "1. To rotate a point 90° CLOCKWISE about the origin,\r\n" );
document.write( "Change the sign of the FIRST coordinate, then swap them.\r\n" );
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document.write( "2. To rotate a point 90° COUNTER-CLOCKWISE about the origin,\r\n" );
document.write( "Change the sign of the SECOND coordinate, then swap them.\r\n" );
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document.write( "If you want to rotate the triangle 90° CLOCKWISE, follow\r\n" );
document.write( "rule 1:\r\n" );
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document.write( "D(-1,1) --> D'(1,1) \r\n" );
document.write( "E(5,-1) --> E'(-1,-5)\r\n" );
document.write( "G(4,5)  --> F'(5,-4)\r\n" );
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document.write( "If you want to rotate the triangle 90° COUNTER-CLOCKWISE, follow\r\n" );
document.write( "rule 2:\r\n" );
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document.write( "D(-1,1) --> D'(-1,-1) \r\n" );
document.write( "E(5,-1) --> E'(1,5)\r\n" );
document.write( "G(4,5)  --> F'(-5,4)\r\n" );
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document.write( "Edwin
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