document.write( "Question 1194226: Assuming that the exact area of a sector determined by a 40° arc is
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Algebra.Com's Answer #826368 by ikleyn(52794)\"\" \"About 
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document.write( "40°  is  \"1%2F9\"  of the full rotation.\r\n" );
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document.write( "So,  the given area of  \"%289%2F25%29%2Api\" cm^2  is  \"1%2F9\"  of the total area of the circle.\r\n" );
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document.write( "It means that the total area of the circle is  \"%2881%2F25%29%2Api\".\r\n" );
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document.write( "In other words,  \"pi%2Ar%5E2\" = \"%2881%2F25%29%2Api\".\r\n" );
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document.write( "It implies. after reducing  common factor \"pi\"  in both sides,  that\r\n" );
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document.write( "    \"r%5E2\" = \"81%2F25\",  or  r = \"sqrt%2881%2F25%29\" = \"9%2F5\"  cm.\r\n" );
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document.write( "ANSWER.  The radius is  \"9%2F5\"  cm = 1.8 cm.\r\n" );
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