Answers

2016-07-25T13:16:27+08:00
X=constant value measure bet dimensions of the rect.; 2x[5x]=90; 10x^2=90; x^2=9; x=3....ans..constant value
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2016-07-26T00:44:14+08:00
If the sides of the rectangle are in the ratio of  2 is to 5
  then if the width =  2x,   the length will be =  5x
  also  2x* 5x  =   90cm²
            10x²   =   90
                 x²  =    90/10    =  9
                 x   =  + 3 or - 3
      the width  =  2x = 2* 3  = 6cm
      the length =    5x  =   5* 3  =15cm
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