Answer:
9:16
Explanation:
In a similar rectangle , the ratio of lengths should be equal to ratio of widths.
Ratio of lengths =

Hence , Ratio of widths =

Area of rectangle 1 = Length 1 × Width 1 = 3×3 = 9
Area of rectangle 2= Length 2 × Width 2= 4×4= 16
Ratio of areas of both rectangles =
