document.write( "Question 938083: Find the length of a diagonal of a rectangle with length 8cm and width 4 cm?
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Algebra.Com's Answer #571417 by Edwin McCravy(20059) $\"\"$ $\"About$

You can put this solution on YOUR website!

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document.write( "The green line labeled D is the diagonal.  Let's erase the left \r\n" );
document.write( "and top sides of the rectangle, like this:\r\n" );
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document.write( "Now as you see, we only have a right triangle and its hypotenuse\r\n" );
document.write( "is D.  So we use the Pythagorean theorem:\r\n" );
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document.write( "D² = 8² + 4²\r\n" );
document.write( "D² = 64 + 16\r\n" );
document.write( "D² = 80\r\n" );
document.write( " D = \r\n" );
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document.write( "You can either do that with a calculator and get\r\n" );
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document.write( "D = 8.94427191 cm., rounding it \r\n" );
document.write( "off as your teacher requires.\r\n" );
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document.write( "Or else you can give the exact answer in radical form:\r\n" );
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document.write( "D =  cm \r\n" );
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document.write( "Edwin

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