document.write( "Question 1043662: The perimeter of a rectangle is 80 feet. Express its area, A as a function of the length x of a side. \n" ); document.write( "

Algebra.Com's Answer #658810 by ikleyn(52890) $\"\"$ $\"About$

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document.write( "Let L be the length of the rectangle, and W be the width.\r\n" );
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document.write( "Then L + W + L + W = P, perimeter, or  2*(L+W) = P,  or  L + W =  =  = 40 feet.\r\n" );
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document.write( "Hence, W = 40 -L.\r\n" );
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document.write( "The area of the rectangle is equal to \r\n" );
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document.write( "A = L*W = L*(40-L) = .\r\n" );
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document.write( "So, A =  expresses the area of the rectangle as the function of L.\r\n" );
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\n" ); document.write( "\n" ); document.write( "You can find many simple solved introductory problems on area of rectangle in the lesson \r
\n" ); document.write( "\n" ); document.write( " - Problems on the area and the dimensions of a rectangle\r
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