Question 374823
The perimetre = P = 18 cms (given)
Let the width be W so the length would be 2W
perimetre in terms of L and W is ...
P = 2(2W + W) 
P = 2*3W
18 = 6W 
now divide both sides by 6
W = 18/6 = 3
L = length = 2 W = 2*3  =6
Area of the rectangle = Length * width = 6* 3  = 18 square cms
This is the final answer