Question 193709
Area  =  L  *  W,  but  L=4w,,,  A = 4w*w = 4 w^2
Given  A=196=4 w^2
49=w^2
w=  +/-  7,, (-7  is  not  realistic)   therefore  w=7
,
Dimensions  are,,,,7  by  28  ***********
, 
checking
A=l*w = 28*7=196,,,ok