document.write( "Question 631464: the diagonal of a rectangle is 15 cm. long. If its length is 3 cm. longer than its width, find the perimeter of the rectangle
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Algebra.Com's Answer #397594 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi,
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document.write( "the diagonal of a rectangle is 15 cm. long. 
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document.write( " length is 3 cm. longer than its width 
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document.write( "Question states*** 
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document.write( "appying the Pythagorean Theorem
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document.write( " x^2 + (x+3)^2 = 225
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document.write( " x^2 + x^2 + 6x + 9 = 225
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document.write( " x^2 + 3x - 108 = 0
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document.write( "factoring
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document.write( " (x +12)(x-9) = 0
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document.write( "       x = 9cm, its width (throwing out negative solution for unit measure)
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document.write( "              length = 12cm  
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document.write( " P = 2*9cm + 2*12cm = 42cm 
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