Question 874641
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Hi,
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P = 2L +2w = 42cm
     L + w = 21  {{{L = 21-w}}}
A = Lw
   (21-w)w = 90cm^2
   w^2 - 21w + 90 = 0
  (w-15)(w-6) = 0
Dimensions: 15cm by 6cm