Answer :
If the rectangles are similar, then the ratio of corresponding sides are in proportion.
12/x = 9/8 where x is the length of the smaller rectangle
Cross multiply to get:
9x = 12*8
x = 32/3 which is 10.67 approx
12/x = 9/8 where x is the length of the smaller rectangle
Cross multiply to get:
9x = 12*8
x = 32/3 which is 10.67 approx