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22-01-2015
Mathematics

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the length of a rectangle is four times its width. if the area of the rectangles is 100 ft sfind its perimeter

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22-01-2015

[tex]length=4width\\\\ Area=length*width\\\\ 100=width*4width \ \ \ | divide\ by\ 4\\\\ 25=width^2\ \ \ | sqrt{}\\\\ width=5ft\\ length=4*5=20ft\\\\ Perimeter=2width+2length\\\\Perimeter=2*5+2*20=10+40=50ft [/tex]

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