document.write( "Question 814819: Find the perimeter of the rectangle
\n" ); document.write( "whose length is 40cm and a
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Algebra.Com's Answer #490541 by josgarithmetic(39617)\"\" \"About 
You can put this solution on YOUR website!
Let y = size of unknown side.
\n" ); document.write( "\"40%5E2%2By%5E2=41%5E2\", because the diagonal is the hypotenuse of the triangle with the legs, 40 and y.\r
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\n" ); document.write( "\n" ); document.write( "\"y%5E2=41%5E2-40%5E2\"
\n" ); document.write( "\"y=sqrt%2841%5E2-40%5E2%29\" which is simplifiable as
\n" ); document.write( "\"y=sqrt%28%2841-40%29%2841%2B40%29%29\" --------- Do you recognize why?
\n" ); document.write( "\"y=sqrt%281%2A81%29\"
\n" ); document.write( "\"y=9\"\r
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\n" ); document.write( "\n" ); document.write( "Solved for y is the main missing piece to finding the answer to the actual question, which I now leave for you to finish.
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