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A rectangle has a perimeter of 60 cm and an area of 210 cm^2.  What are the dimensions of the rectangle?

 Jul 24, 2020
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Perimeter     2l + 2w = 60

area               l * w   = 210       w = 210/l    sub this into the first equation

 

2l  + 2 * 210/l   = 60

2l^2  -60l + 420 = 0      Use quadratic fromula to find   l  &  w   =   15 + sqrt15      and     15 - sqrt 15   cm

 Jul 24, 2020

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