Find the area of a figure

Question

If the ratio of the perimeter is 3/7, and the area of small figure is 11square units, find the area of enlarged figure

Answer 1

if the ratio of the perimeters is a/b, then the ratio of the areas is a^2/b^2

if the ratio of the perimeters is 3/7, then the ratio of the areas is 9/49

9/49=11/A

9*A=49*11

9A=539

A=539/9

A=59.888... square units