Question 170311
2*12+2*8=24+16=40 ft. for your perimeter.
2*18+2*12=36+24=60 ft. for Lena's perimeter.
60/40=1.5 is the ratio of the perimeters. 
12*8=96 ft^2
18*12=216 ft^2
216/96=2.25 is the ratio of the area.