Alexandra55 Alexandra55

08-04-2015
Mathematics

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The length of a rectangle is three times it's width. If the area of the rectangle is 147 metes squared, find its perimeter.

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konrad509 konrad509

08-04-2015

[tex]l=3w\\ lw=147\\\\ 3w\cdot w=147\\ 3w^2=147\\ w^2=49\\ w=7\\\\ l=3\cdot7=21\\\\ p=2l+2w\\ p=2\cdot21+2\cdot7\\ p=42+14\\ p=56 [/tex]

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